Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6535f232e141f4f…

MALICIOUS

PDF

47.3 KB Created: 2020-10-16 08:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c20d1d6e30bc75b17626bd1c783bb6a1 SHA-1: f7db9c4fff7d596215214b7902da2e8da08a8534 SHA-256: c6535f232e141f4f2ce4eccd95997e509fb24cb6e2adc38b7ce9647918cd9a1e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file functions as a link farm, containing numerous embedded URLs that point to external resources. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these URLs leads to known malicious redirector infrastructure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of tricking users into downloading password-protected archives, often used to bypass security scans. The document body contains obfuscated text and embedded URLs, reinforcing the link farm and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=sightseers+guide+crossword+clue In PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/fewoxepiduxemus.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/1930383.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/ruvafegebipe.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/jufukabovozan_pimufasumaguxu_paligedepis_watolom.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/gapovowumepekegosiza.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/23dcc5ae3a6204.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/96c09c94888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88c2e5b-75d3-479a-b7f7-29280b39e3cd/9810040642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3074676-33e8-4cdd-bb2f-712fcf699cfe/84858260579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda2ea31-f184-4ce9-9ba1-375213afd6d8/kitabawufavoduvosik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9cdcfe-d987-4624-a46e-5d3c678ff2e3/sajedixelosizagefiwekof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa15d35a-9488-4763-aeae-82efd1f9a186/pinepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86c91ff-72e7-4ba1-9c2d-992cc9f34a62/mowasowedupuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6379/5094/files/dawegelafikamapalulage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3030/1853/files/cartas_de_ishihara_descargar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7754/1281/files/wiat_iii_hand_scoring_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8511/4781/files/holmes_box_fan_target.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8105/5390/files/lewudixoxepirugarakodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d003c51-fc30-4662-ac07-fea3b512a2d0/36761152785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d50418-b8b7-4afe-a5ea-40b7a9ba82e8/xesepigewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58d0c89-9189-48d5-b394-dda01868dfb7/kekigosudaxezubekumoparip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a41c43-d5a6-42d3-89b5-19711d0a7348/97038573447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c464f0d-9696-4a83-bef8-4a3116363d31/70866656307.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A71 5188 bytes
SHA-256: d08ad22c8d3e8cd69d5132ca881b79cd174ac68fb5154915df46ac8935b35c2d
font_01_sfnt_off00008c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1E 10552 bytes
SHA-256: ff717d2e84d7cab8220e8c28c8ee18bf14bf3f6e60931ecc756a899d139bfb33

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