Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bf95bc8a460a0a…

MALICIOUS

PDF

51.9 KB Created: 2020-08-08 14:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b31f428a9bd18763505f963563edcc8a SHA-1: 2781cd4f7245dc9ac03032d2c3d3c6a7976ab615 SHA-256: 07bf95bc8a460a0a07402b782adfa48f3b1bf1a0411b4684aa97ecfbeb63b585
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure to download a file splitter, which is a common social engineering tactic. It embeds numerous links, including one pointing to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=pdf+file+splitter+free+download`. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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=pdf+file+splitter+free+download
    • http://files.berodinwaxcanada.com/uploads/1/3/1/6/131637701/3ce9399.pdf
    • http://wotuzezun.anxietyannarbor.com/uploads/1/3/0/9/130969754/wejogivatunog_funaw_xuximiwejiv.pdf
    • http://files.riverpilatesny.com/uploads/1/3/1/3/131398517/b6516b26.pdf
    • http://files.syracuseorangehoopscenter.com/uploads/1/3/0/7/130776745/mozogemixi_ludoxipapi.pdf
    • http://files.yourfurry-godmother.com/uploads/1/3/2/8/132814342/7688247.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/dikuvafidojej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/29425601021.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/pabul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pedarivorenali.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/gujaki.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2070/files/78039885648.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/nawogedufimupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/86902865205.pdf
    • https://cdn.shopify.com/s/files/1/0433/0615/6190/files/31175398422.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/spoken_english_notes_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/mipobilerenezeragejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2118/8763/files/jim_wynn_vw.pdf
    • https://cdn.shopify.com/s/files/1/0440/4104/4118/files/sotobatagogu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa2.bin
53b192d7bd7e3e362331350f5809ec2af5aa97521295d0774315bb7dc7793972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA2 4916 bytes
font_01_sfnt_off00009073.bin
9d64df3e51e93fa8f099d5ce174ef9c39def73e60c21292cce0402c339d37785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9073 10416 bytes
font_02_sfnt_off0000b410.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 4324 bytes

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