Malicious PDF — malware analysis report

Static analysis result for SHA-256 307b859fc85feba8…

MALICIOUS

PDF

41.4 KB Created: 2020-09-20 00:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ccb0e141be764ebf2a0e153b83188c5 SHA-1: 5d934ab83827ad6268a0d7e8fa1d7be7daa8921c SHA-256: 307b859fc85feba868bace5e3ac6df4ed3f5206a7a3b9c35475e0dc122bbd084
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 pointing to other PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector (https://ttraff.link/wix?keyword=the+westing+game+movie), indicating a likely attempt to distribute further malicious content or lead users to phishing pages. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=the+westing+game+movie
    • http://files.worldseatraveler.com/uploads/1/3/0/8/130874012/633831.pdf
    • http://files.centralrefrigerationinc.us/uploads/1/3/1/4/131452944/dc9c5798e.pdf
    • http://fepek.crimestop.net/uploads/1/3/1/4/131406893/a6088.pdf
    • http://jukebud.redeemernewton.com/uploads/1/3/2/6/132683008/paginowevugalap.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/zugikewuzumabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9144/3364/files/calculus_1_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7605/0330/files/tinkers_construct_guide_1._12._2.pdf
    • https://64067f65-264d-446f-a182-98883dac4d61.filesusr.com/ugd/1cc7e8_508b3c63e5d4406a98da0532abbcf0e6.pdf?index=true
    • https://d8de2fac-6ed0-47aa-9a1c-003ce05312b2.filesusr.com/ugd/ca9b0a_17f1792a882a4b509acdd53c3496a736.pdf?index=true
    • https://2d856960-6d9c-476e-9a96-3a95f0bed940.filesusr.com/ugd/0d089b_2419181663934889a4aa18ed4134e8f4.pdf?index=true
    • 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_off000065a5.bin
29ce6d3977ac664eff630078fc4a42cd0e903dbec265b9445a2611eb36c01c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A5 5072 bytes
font_01_sfnt_off000076db.bin
8c3e18359b42851bec4b10ce8ac8e2c47478d27219415392da8ee26a98576b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DB 10168 bytes

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