Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0d1b7688a13059…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 15:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7671ff346be01210414db86267f34017 SHA-1: 64573cfa8f00f6b79e80fe2a17be372451dc43dd SHA-256: 5f0d1b7688a1305904466407c3889bae98d615c922292c61b0e20f336e85cb96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to an 'accountant jd pdf' and includes the malicious URL. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful sites.

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=accountant+jd+pdf
    • http://laviba.idlewoodvenue.com/uploads/1/3/2/6/132681556/bobomug_daxigifanajiwex_gawixegow.pdf
    • http://files.agiteysirva.com/uploads/1/3/1/4/131453695/minitokateka.pdf
    • http://files.tallmrhall.com/uploads/1/3/0/8/130874026/jufawilisir-lewivuvo-fixoluvagokino.pdf
    • http://vifam.stern-line.com/uploads/1/3/2/6/132682646/dd8fbf06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6496/5782/files/kazolobuzakagu.pdf
    • https://cdn.shopify.com/s/files/1/0463/6511/4523/files/fujiwivibari.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9685/files/tunosutiku.pdf
    • https://cdn.shopify.com/s/files/1/0449/0733/1739/files/basidiomycetes_fungi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9306/4870/files/90092791174.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/9783335370.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/yajur_veda_avani_avittam_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/45596148385.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/whatsapp_video_call_please.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/87965736585.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/powelivul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000675b.bin
f5b51408d8e8b02b894603b15af0aa4e795956ca31b7aac0f5fbecf4f5eb1bff
pdf-font-stream PDF embedded font (sfnt) at offset 0x675B 4908 bytes
font_01_sfnt_off0000782b.bin
172b27d942f5a717b12f4034d0ddf309affbd462c4f310f45ead7a37d697e15f
pdf-font-stream PDF embedded font (sfnt) at offset 0x782B 10076 bytes