Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac06c1dec378443…

MALICIOUS

PDF

40.2 KB Created: 2020-08-16 00:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fae51aaaff25d2657fe0ac9b0c38083c SHA-1: 4184bddf725d57e7e3603d27f7eb88d9f4047cf3 SHA-256: 3ac06c1dec378443bbd0f3c7b2e031740311c4a7d0c723c5616d8dd24306a471
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to drive traffic to potentially harmful 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.ru/pify?keyword=bsplayer+pro++serial
    • http://nerujut.troop1199garlandtx.com/uploads/1/3/1/3/131384605/ragosewemomuf.pdf
    • http://files.naplespubliclibrarymaine.org/uploads/1/3/1/8/131856121/molamikumedux-jawuju.pdf
    • https://cdn.shopify.com/s/files/1/0439/4414/9150/files/78559746128.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/arabian_nights_book_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1098/files/feniba.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5790/files/wifamafabusuxunusuvedunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.pdf
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/21303482308.pdf
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/transactions_essential_english_language_skills_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3744/8609/files/kifotozunigisizufeti.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/19983937378.pdf
    • https://cdn.shopify.com/s/files/1/0431/4320/0929/files/57611113447.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6161/files/google_interview_questions_and_answers_for_software_engineer.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/mafusiwufe.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_off00005fd5.bin
9fe798b5b2437b903230a8e31092cea1af6cabcf38ac789cbba6f082a321219b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD5 4964 bytes
font_01_sfnt_off000070cd.bin
e886a271e88f61f145384e3477e5db587280fe7893d2e5cddbe00c5220abc5d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x70CD 10476 bytes