Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edfc0311bf03798…

MALICIOUS

PDF

52.6 KB Created: 2020-08-31 09:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae765678f18c266434c38e4e7d98781 SHA-1: fd3939662dd655339170e4c2d380d6274b029804 SHA-256: 7edfc0311bf03798e3269b027d1e1a475e11b9242da619e1113273e8df7304e4
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary link leads to 'ttraff.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness.

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=exercice+corrig%25C3%25A9+cycle+de+vie+d%2527un+produit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/26938b_ec12da8410b3422abba17ebb7445bd80.pdf
    • https://static.usrfiles.com/ugd/7c30af_852968ed61f749fcb79737472955f564.pdf
    • https://static.usrfiles.com/ugd/de3d83_17618e20dfff4d93a201b2f45d0fb7ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_80d801aaee1948f588f258b845f024c8.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/bhojpuri_dj_remix_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/93455689089.pdf
    • https://cdn.shopify.com/s/files/1/0437/8371/7015/files/xuzefipadujufar.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/de_broglie_wavelength_equation.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/golafedejaxuxojibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4503/files/small_printable_protractor.pdf
    • https://static.usrfiles.com/ugd/9f6a24_97ec29498bbf4ed0a89a1be8fce69436.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_30014268cad44c03833e9c7e7dd5866f.pdf
    • https://static.usrfiles.com/ugd/10b11f_86f4ec0651504c6c91be4da5425508a9.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_off0000881b.bin
6badce0b383c625b8bfb3e2c633098878c47144e1e833a28a729f0bf4fc7886d
pdf-font-stream PDF embedded font (sfnt) at offset 0x881B 5216 bytes
font_01_sfnt_off000099b6.bin
1249d45a91a9a912513e4c750932a5cb9ec0410a7e3521cfaf384b713ea79ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0x99B6 13408 bytes