Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58abdf403b843ed…

MALICIOUS

PDF

66.6 KB Created: 2020-08-15 12:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20db912378d43a68cd8397db4055c764 SHA-1: 64416f1e768d0e6dbf6b005a0f8c0b08a85cf442 SHA-256: b58abdf403b843edb8d22bb5fa02b187c56d87244740f82f50a80829f4a62a2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. One prominent link, 'https://ttraff.ru/wb?keyword=proliant%20dl380p%20gen8%20manual', points to known malicious infrastructure. Another heuristic identified a PDF link farm, suggesting a broad attempt to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/wb?keyword=proliant%20dl380p%20gen8%20manual
    • http://kuzabot.searchlc.com/uploads/1/3/1/6/131606069/xoxumiku.pdf
    • http://files.melbournecarspotters.com/uploads/1/3/1/4/131409244/2bf972f8.pdf
    • http://files.pierrepaulbitton.net/uploads/1/3/2/7/132712447/jutapolopalozonorap.pdf
    • https://cdn.shopify.com/s/files/1/0438/4918/7493/files/matudovoxufalugivibamupek.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0512/files/tv_guide_lancaster_pa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/16165731514.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7535/files/kodetivasirisebotabumusem.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/66027187313.pdf
    • https://cdn.shopify.com/s/files/1/0430/4732/1751/files/gigutakanadepiwonobajuku.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/76895447255.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/sociology_book_for_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/91673892618.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/76593038100.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/46977544282.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/
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/76593038

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc8.bin
97b5864e398b8c5cf89545bf32458e2b216e16bf81ade913f74492d2a5197caf
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC8 5604 bytes
font_01_sfnt_off0000d2b1.bin
b9240311d594964c21cc63e728e88bceb424d29237e39b76bd58ddcb70e0445c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 13860 bytes