Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e7bf2ee502f068…

MALICIOUS

PDF

42.4 KB Created: 2020-09-17 19:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e63001445ffedcbab4fa3f9455ac6c5 SHA-1: 2be8939642d54a3f2d7f7c92e44bbe6b4f5a6c9d SHA-256: b6e7bf2ee502f068e6929d3493d9dfb2d2d454cf97e3b76200eff9e9310cfe5c
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 external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector link found in the heuristics. This indicates the primary goal is to redirect the user to 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.link/wix?keyword=chapter+5+membrane+structure+and+function+worksheet+answers
    • http://files.shimritlee.com/uploads/1/3/1/3/131380739/viwatafi.pdf
    • http://gevufape.fleischerstudios.com/uploads/1/3/2/6/132680981/ruxomu.pdf
    • http://files.lizzlund.com/uploads/1/3/0/8/130874680/13aa11.pdf
    • https://2c924f1d-4840-4401-b436-bf1ae116fd23.filesusr.com/ugd/e2c223_4eb0215b4ecc4256bf1e39fe64d22430.pdf?index=true
    • https://e20402cb-1f38-4d9e-ad39-0278431cbd12.filesusr.com/ugd/b56239_c2bf964813924686936b9e82ac5abbd7.pdf?index=true
    • https://5b622ee9-fd25-450b-8f18-458498ca6f3b.filesusr.com/ugd/7ab50f_37b2e92935004710811da455263856d0.pdf?index=true
    • https://bd4b223e-9b73-4b2b-ad10-1518a40a5555.filesusr.com/ugd/0adedf_d417e20e5e0f43caa7e50cb58cca0900.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/7938/4734/files/baldi_s_basics_field_trip_pc.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/87618016737.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bixebor.pdf
    • https://cdn.shopify.com/s/files/1/0437/5373/4298/files/madulimuvakasanik.pdf
    • https://cdn.shopify.com/s/files/1/0465/3986/6270/files/39871632023.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0437/3155/0362/files/imagination_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/antonio_candido.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/vajedosadirerazodode.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_off00006744.bin
cac1174314be723e1ce602c3f03228168f56fdf7c7c1d351474e3768162c6c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6744 5688 bytes
font_01_sfnt_off00007a7d.bin
7f7eb42ef50878aef4584740e45155e983257c1f139e07fa63c0297295ecd9a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7D 9836 bytes

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