Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6cb1d48c1731d4…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 20:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49d4705f601e91dca51c293851bf4e58 SHA-1: 728136c881c8d26bc9619bd6536b32288a116817 SHA-256: 0f6cb1d48c1731d427a3d2e021bcb12ddb38bcb9dd6af610c2e9bcffa8b9d0ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various PDF files, likely to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.ru/wix?keyword=casa+de+la+calidad+xls
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/ferasigipux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/65123546198.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/9341577175.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/aspirin_primary_prevention_guidelines_canada.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30812088679.pdf
    • https://cdn.shopify.com/s/files/1/0449/5792/5544/files/dungeon_defenders_alchemical_laboratory_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62092070186.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/google_sheets_if_statement_with_or.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/lugebi.pdf
    • https://static.usrfiles.com/ugd/defcb2_944ce41e8bc041099afbd07f96dca672.pdf
    • https://static.usrfiles.com/ugd/b8c837_98a330be0f8a412cbd134df2c0a42fea.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/28419144959.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/15956585204.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/cajun_injector_electric_smoker.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c5e.bin
c3a1f4c4deb61dedede815a89090a53c137e20b46f03c3e89ca9ede9beb24e55
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5E 4808 bytes
font_01_sfnt_off00006cc7.bin
6d56277c29b2fd174586ff55556c48b9bb46162989a84f617799881d10d159de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC7 10936 bytes