Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcdb71f50f9a099…

MALICIOUS

PDF

42.2 KB Created: 2020-08-17 11:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30852986852ce66697a53617f7966d6e SHA-1: 7b01e7adf6c0beb5c1058a1248f8c6373d0a377a SHA-256: cbcdb71f50f9a09924747f1965ca9d5c899b27348b46f86faf9027ab04f09f39
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to external PDFs hosted on Shopify. One URL, 'https://ttraff.ru/pify?keyword=breast+lump+treatment+guidelines', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other PDF links, suggesting a link farm or SEO manipulation tactic to distribute 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.ru/pify?keyword=breast+lump+treatment+guidelines
    • http://files.mariacioe-pena.com/uploads/1/3/0/8/130813095/mekebixevodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/formation_adjointe_administrative_virtuelle.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/zevufo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5234/2184/files/mirofojojepufosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/37826295959.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fikikotiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/faxawasadalavixujikuti.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/advanced_mathematics_questions.pdf
    • https://cdn.shopify.com/s/files/1/0435/4709/9290/files/20825781729.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_off00006575.bin
40ccbf6d4fc76b9475c2a37bde411f75da935eb75e255d543aca46d65da15446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6575 5328 bytes
font_01_sfnt_off00007776.bin
a99bb7c1e7cda870e6ffeff9948be83495a59e35959fa07573267cf2e39b49d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7776 10916 bytes

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