Malicious PDF — malware analysis report

Static analysis result for SHA-256 af87798332429e6a…

MALICIOUS

PDF

42.2 KB Created: 2020-08-11 13:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dea99721dc06e7749dca2f0d1f13eb9a SHA-1: 96ef0dffcb6c0bfba661c320d7f82ea1df0ad3e2 SHA-256: af87798332429e6abd7970cba394b051ceffc9abbaa8bca3edcb6041125a0d49
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 Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc). The document body, though partially corrupted, contains the phrase 'Importance of fasting and prayer pdf' and references wkhtmltopdf, indicating a potential lure. The primary malicious IOC is the redirector URL, which likely serves as a gateway to 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=importance+of+fasting+and+prayer+pdf
    • http://belexari.jlkarchitecturaldesign.com/uploads/1/3/2/8/132814930/zuxek.pdf
    • http://files.krromero.com/uploads/1/3/2/6/132682230/c30558bb4cbb0.pdf
    • http://files.adamisbitsky.com/uploads/1/3/0/9/130969703/5124593.pdf
    • http://files.leanwithluke.co.uk/uploads/1/3/1/4/131437930/tipuzusudizuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/77145261620.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/98347669456.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/zepubawubukituxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/69555123442.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vibemegabixowosepabotabux.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/healthy_meal_planner.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/nuzoladelakojireputaxadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/febotavafita.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/lolomogosabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/33130033832.pdf
    • https://cdn.shopify.com/s/files/1/0433/2565/3160/files/the_plague_albert_camus_free_download.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_off0000655b.bin
9030f657b4b780e6b4d2da4dab58369231570473b9ab4c7d4822ce7cd7615c2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x655B 5484 bytes
font_01_sfnt_off000077e1.bin
7c5ae3add87731fea2f8e0dc861ea06cbd907663f46c2df603fec6effff2ec45
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E1 10548 bytes