Malicious PDF — malware analysis report

Static analysis result for SHA-256 461e265c75723d0a…

MALICIOUS

PDF

47.5 KB Created: 2020-08-27 19:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e38c13f71022763e0f0d174f0abfa4e1 SHA-1: e8d62d8c91a7689f134bec914dc461df6c3406ed SHA-256: 461e265c75723d0ae8e8d89be45e105b061e8bf5a24db6f2ae907ef024a5d4ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=que+es+la+investigacion+cuantitativa'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be garbled, but the presence of the malicious redirector URL and the link farm heuristic strongly suggest a phishing or content-luring attack pattern.

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/pify?keyword=que+es+la+investigacion+cuantitativa
    • http://files.fionamatisse.com/uploads/1/3/0/7/130775515/1933836.pdf
    • http://files.lightworkselectricny.com/uploads/1/3/1/4/131453432/pedobanuvusekamamil.pdf
    • http://lisejuzi.sheldonfernandez.com/uploads/1/3/1/3/131384635/xelugifitajitej.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/lesug.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/civic_education_questions_and_answers_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0435/3032/2084/files/xoreje.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/tebiveverefujife.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/zogutokadigizosogilowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/types_of_antiretroviral_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7452/files/filenona.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/woputapejasazewimal.pdf
    • https://cdn.shopify.com/s/files/1/0435/3094/4671/files/r_kelly_birthday_song_free_mp3_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/49455870889.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/86649593195.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000726d.bin
55e2e7fe77027448c73b36111cc8b4c1a13599885c545c4f85e90d3e8d9b732d
pdf-font-stream PDF embedded font (sfnt) at offset 0x726D 4992 bytes
font_01_sfnt_off00008388.bin
47037f46fdebdd84b1c909b24149331356728d731304d6abcf1a65099902ee39
pdf-font-stream PDF embedded font (sfnt) at offset 0x8388 14432 bytes