Malicious PDF — malware analysis report

Static analysis result for SHA-256 989d4efb5f4decf6…

MALICIOUS

PDF

37.2 KB Created: 2020-07-29 02:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e53beb09ef2e66234a37d93890271a09 SHA-1: dacd0b0acf446e58d39cd55a745fe6fb7f531702 SHA-256: 989d4efb5f4decf6f6e64a9aeb0fcabf9abf69ed04db9249f69bf202ac705bd9
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to 'F b lite app' and the authoring application 'wkhtmltopdf', suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates 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=f+b+lite+app
    • http://files.quadrysteria.com/uploads/1/3/1/4/131453990/8323f8753bab9.pdf
    • http://files.allisonchristmasspectacular.com/uploads/1/3/0/7/130740210/0b4fc2ff0.pdf
    • http://files.thepatentshoppe.com/uploads/1/3/1/1/131163846/xamubikoxizidazul.pdf
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/doluvufufepafozovesadil.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/guwekojapejadizibukuso.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/84580436826.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/donatiguzotipefilujizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3541/files/17652965930.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4121/files/tefisugomasamamonenaxup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/77462270885.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/54713605803.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0429/7369/2063/files/jeroboremibudixodinux.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2661/files/xazewuwunapadurimoves.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/rotux.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/gixixiposiwilamu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2373/5720/files/siwivol.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_off000057b2.bin
033ab0081bb6e78e02b5f783d6620744365297064f52d7dd659ff420b5019c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B2 4208 bytes
font_01_sfnt_off000065f2.bin
6559eb218477093ca892364c774494de87165038eef828591781641c6693f2b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F2 9940 bytes

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