Malicious PDF — malware analysis report

Static analysis result for SHA-256 2883395749d3c892…

MALICIOUS

PDF

54.2 KB Created: 2020-08-20 00:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f471a843186e01faf8526e4ae2e9b99a SHA-1: a3afff05b8a1fc2cc5f16d66c595f22f958cab4f SHA-256: 2883395749d3c8923debf4b185f196afa4f56347f139eb87163ad5d198179a42
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDF files, indicating a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to manipulate search results or distribute further malicious content.

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.cc/pify?keyword=beginning+intermediate+algebra+5th+edition+pdf
    • http://files.ontariomotorcycleaccidentlaw.com/uploads/1/3/1/3/131384401/nagexiletu-nometumik-molederekulusij.pdf
    • http://debaseker.jamesdonlon.com/uploads/1/3/0/7/130775162/bonuledukul_gotuwejadenoz.pdf
    • http://files.edukatewellness.com/uploads/1/3/0/7/130775834/suwoxumamoxim_bawuwinoxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/zirafebujebabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7581/4047/files/xosekunejopulusazap.pdf
    • https://cdn.shopify.com/s/files/1/0438/8097/2456/files/amma_rajinama_movie_audio_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9712/0151/files/senefadulijujugitefol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/16793185514.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/bedford_reader_chapter_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/ayushman_bharat_hospital_list_ahmedabad.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/telugu_horror_movies_hd.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/assessment_of_communication_and_interaction_skills_acis.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_off0000930b.bin
9aa3f1d67b3f6377a6433780eb485055e10c30bd7941db022838b33926abdda7
pdf-font-stream PDF embedded font (sfnt) at offset 0x930B 5588 bytes
font_01_sfnt_off0000a5e1.bin
529dee1838cf8d78ea8421c55f986a40c460b8a3f2839d003bcb26d85c81d2b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E1 11348 bytes