Malicious PDF — malware analysis report

Static analysis result for SHA-256 0364170f4a0576f0…

MALICIOUS

PDF

45.8 KB Created: 2020-10-08 02:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a812771bc358040b804c20cbc7e2e7d3 SHA-1: d1424f54e4a40e7d5932b3b67c500678e2baf34e SHA-256: 0364170f4a0576f0666c0f404b4c290e87d2495a387c0e0913259f7b09c85ec7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to other PDF files, indicating a link farm designed to manipulate search engine results or distribute further malicious content. One URL, 'https://cctraff.ru/pify?keyword=the+gift+of+the+magi+activities+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/pify?keyword=the+gift+of+the+magi+activities+pdf In PDF document text
    • http://files.stmaryswestcolumbia.com/uploads/1/3/1/3/131379189/pimesekoromik.pdfIn PDF document text
    • http://makadulo.ofiar.org/uploads/1/3/2/8/132814930/papufuxilil.pdfIn PDF document text
    • http://files.catninga.com/uploads/1/3/0/9/130969897/vabudabalakumez.pdfIn PDF document text
    • http://varotenaz.pharmaciecocagne.ca/uploads/1/3/0/7/130738850/wumitu-basigu-novixakexav-pizulefatefi.pdfIn PDF document text
    • http://litiju.traveltastically.com/uploads/1/3/2/7/132740948/kawuwisu-kujinofox-gunedomukipogi.pdfIn PDF document text
    • http://ragigodik.fhcspartanswrestling.com/uploads/1/3/2/6/132695399/vifenasavi.pdfIn PDF document text
    • http://files.bernadettebuote.com/uploads/1/3/1/6/131606875/1611927.pdfIn PDF document text
    • http://bumilu.quintessencemc.com/uploads/1/3/1/4/131438729/1936915.pdfIn PDF document text
    • http://xelen.nicelawoffice.com/uploads/1/3/0/7/130739094/289535.pdfIn PDF document text
    • http://files.mgarrigan.com/uploads/1/3/1/8/131872087/1133776.pdfIn PDF document text
    • http://rifofiw.realtimecases.net/uploads/1/3/1/4/131438142/supuwunijoxuwenares.pdfIn PDF document text
    • http://files.cithebrand.ca/uploads/1/3/0/7/130740596/912a4.pdfIn PDF document text
    • https://site-1039906.mozfiles.com/files/1039906/nabuberevozojamib.pdfIn PDF document text
    • https://site-1039730.mozfiles.com/files/1039730/13161391555.pdfIn PDF document text
    • https://site-1039355.mozfiles.com/files/1039355/30730065628.pdfIn PDF document text
    • https://site-1036675.mozfiles.com/files/1036675/81443390074.pdfIn PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/65921370465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00007382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 5452 bytes
SHA-256: 0ef990018ba6006d1e8a578a7d697e93522a52cd512de1b111ed3fc1e23fec72
font_01_sfnt_off000085fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FA 10644 bytes
SHA-256: 1541c5b458e00ac4e8e041f671907798f89d0aaf73ebd0714fcab6674f18f60a

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