Malicious PDF — malware analysis report

Static analysis result for SHA-256 f597c062c1f641c9…

MALICIOUS

PDF

50.9 KB Created: 2020-09-29 19:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bfcde523e68d0ff2cd16137fb38b3688 SHA-1: e167a9840c12448306e340bc0ac9f622f4cbc568 SHA-256: f597c062c1f641c9b444b97f20dda787065d15c92b0339dea5441952c5a66017
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The ML classifier strongly indicated maliciousness, and one URL is explicitly flagged as a malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely used to lure victims to malicious sites.

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://gettraff.ru/strik?keyword=10+bipartite+settlement+for+clerk+pdf In PDF document text
    • http://files.communityreusenetwork.org/uploads/1/3/2/7/132710601/242944.pdfIn PDF document text
    • http://files.angelageddes.com/uploads/1/3/0/7/130775429/berasobofido.pdfIn PDF document text
    • http://files.soundsofgrace.co.uk/uploads/1/3/1/4/131454090/1089848.pdfIn PDF document text
    • http://pexofa.oceancityweddings.com/uploads/1/3/1/3/131383314/busib.pdfIn PDF document text
    • https://site-1036840.mozfiles.com/files/1036840/18893402739.pdfIn PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/72176615933.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/69749476131.pdfIn PDF document text
    • http://jepitet.katherineelkinsphotography.com/uploads/1/3/2/8/132815065/4c550a211b66.pdfIn PDF document text
    • http://tumareku.amystreasuresdesign.com/uploads/1/3/0/7/130740082/monareroj.pdfIn PDF document text
    • http://punabosi.kaylahdenae.net/uploads/1/3/0/8/130873784/fosopalisidepulug.pdfIn PDF document text
    • http://woniku.holly-west.com/uploads/1/3/1/8/131856772/8c2c8223a4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/99623022285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/21119735183.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A3 5604 bytes
SHA-256: d1cacc40f5e403b300410a27dd406fa4cd1da8355e0f9908aac97d41ac7bbe8a
font_01_sfnt_off00007a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A96 15200 bytes
SHA-256: 5b9764528ea0d854b505e9ee3749d08bdca8277bd934e4a2edcbbacbbf81f0fd
font_02_sfnt_off0000a988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA988 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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