Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1cca279d91c6f5…

MALICIOUS

PDF

50.7 KB Created: 2020-08-02 07:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bcc6b801de3420cc78018c37758222b SHA-1: fbc64fdbd484974f847597ebc5c03ab7190793b8 SHA-256: 4e1cca279d91c6f5c88e3e7ad0803bd773cd9d7f32642c0e50b2e0baeb935b36
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 likely used for SEO manipulation or to distribute further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=trek+bike+trailer'. 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.com/pify?keyword=trek+bike+trailer
    • http://files.kirstennimwey.com/uploads/1/3/2/6/132682655/a0243.pdf
    • http://files.lknailsandbeauty.co.uk/uploads/1/3/2/6/132681938/wovaxale.pdf
    • http://files.zjymbp.com/uploads/1/3/0/8/130813973/walonepumudan_nuvis_suwiv_kupif.pdf
    • http://files.fcapc.org/uploads/1/3/1/3/131380146/mawewaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/56667626807.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/35144196447.pdf
    • https://cdn.shopify.com/s/files/1/0438/1140/5986/files/71869316944.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/mogigisokebixorokajeda.pdf
    • https://cdn.shopify.com/s/files/1/0429/1418/5372/files/10851110459.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/nofixigekadijusedow.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/negaropiwatave.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8922/files/is_it_legal_to_download_youtube_videos.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/vogubovikalugunobogolapak.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/dimumonawopudox.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/memodasorevonileruvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42257023754.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fb6.bin
63d66a04b176481028ee56bf83b1a1a9b98bd316ec98587ae46118d5c56f95c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB6 4224 bytes
font_01_sfnt_off00008e0b.bin
0b838187a4a158b79dad6841eac67e6b4cc6ba994af5acd555b4baa0ecb4c2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0B 9952 bytes
font_02_sfnt_off0000b013.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 4324 bytes

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