Malicious PDF — malware analysis report

Static analysis result for SHA-256 78779ebf613ce71e…

MALICIOUS

PDF

88.3 KB Created: 2020-08-03 03:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd9d3e1551c672e9ae4605b009920dd9 SHA-1: 8de4a53fca0f37990b1c8a8a68ddfde93bc54544 SHA-256: 78779ebf613ce71ef2f9219d983826e2a7aa1c0015586c6652db18b5eb24c3cb
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=drit+bike+games'. Additionally, a large number of links point to external PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was largely unreadable binary data, but the presence of the malicious redirector is sufficient evidence for the 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.com/pify?keyword=drit+bike+games
    • http://files.faubionmiddleschool.com/uploads/1/3/0/8/130874143/5327c939cf367.pdf
    • http://files.bethlehemchristianmission.com/uploads/1/3/0/7/130775320/d602756b33b.pdf
    • http://files.trailffest.co.uk/uploads/1/3/1/3/131398419/ae7f5d26.pdf
    • http://files.milespond.com/uploads/1/3/2/6/132681773/pikuvojozor.pdf
    • http://files.westerhausmetals.com/uploads/1/3/2/6/132681293/bopabinopebasu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/kufulijazafumerasifi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/google_maps_como_chegar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/xuzagobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/megolevejedurafoxekeviz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/23642951945.pdf
    • https://cdn.shopify.com/s/files/1/0433/5704/4890/files/gesibesape.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/58364924377.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/fobipekaridekira.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/63355520109.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/43478505361.pdf
    • https://cdn.shopify.com/s/files/1/0430/7366/7225/files/sutavujox.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/rat_dissection_labeled.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/85706819752.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/66181132094.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_off00011fb5.bin
9bdbef441c34b898eda34497b8ec4d89703f122217c1c79224c460a05d1f41a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 5176 bytes
font_01_sfnt_off00013144.bin
364cb5df94e7a9188d988ba6050a729c578a19d835e822e90bc4be06458c410d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 10192 bytes

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