Malicious PDF — malware analysis report

Static analysis result for SHA-256 645ca1fde86d4563…

MALICIOUS

PDF

53.9 KB Created: 2020-08-11 04:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2c2f8332d364ca8dc7d03727a4402d SHA-1: c86654503a19fa395b79a49e170d719441ed1932 SHA-256: 645ca1fde86d4563f5aa0b463d97da2ef3bedf0126303f23b1976e10028e7c9c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to a link farm infrastructure, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the redirector, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=water+borne+diseases+pdf+in+tamil
    • http://files.memberoftwotribes.com/uploads/1/3/0/9/130969354/3149569.pdf
    • http://files.ambitupstate.com/uploads/1/3/2/6/132681516/7e7bd1276f0ac.pdf
    • http://files.treeoflifeph.com/uploads/1/3/0/9/130968912/c6222.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/axolotl_francais.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/50774316302.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/punedorulununo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84712881745.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/29468335772.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/australia_political_map_blank.pdf
    • https://cdn.shopify.com/s/files/1/0431/3923/5997/files/cursive_writing_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pekuxiwitijumowiviw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/54299604977.pdf
    • https://cdn.shopify.com/s/files/1/0432/4406/0839/files/manual_de_dibujo_tecnico_arquitectonico.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/19597001594.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_off00007f2e.bin
12cc1bbe66a8434a89415334ccaa60b1bc1fa2ef557cb5853e60f76715fcb1f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2E 5340 bytes
font_01_sfnt_off00009140.bin
4c3abbe9ab2e04f876b93955a974f3f421a2ce644a8b1a874ad986731f48e2e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9140 5532 bytes
font_02_sfnt_off0000a38f.bin
f2465e8e8673add0395c373633bdc330bcc7042d65f2af86062ebc792079f782
pdf-font-stream PDF embedded font (sfnt) at offset 0xA38F 11008 bytes