Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f3c8180d23db2a…

MALICIOUS

PDF

39.1 KB Created: 2020-08-02 11:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f718a9d8712d6481c76ebc82e787a98a SHA-1: c2ace2d11f8fd55cc81b9fc2b578ccbda89f9732 SHA-256: 03f3c8180d23db2a6724bd7c5115c62af25e22b80b3df0836ca490355307bc89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=walls+fall+out', which is flagged as a malicious redirector. The presence of numerous links suggests an attempt to manipulate search engine results or direct users to 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=walls+fall+out
    • http://files.lindseyyok.com/uploads/1/3/2/7/132741535/b4b560c1c5c1aca.pdf
    • http://files.simplycfood.com/uploads/1/3/1/3/131381679/supapinatopowu.pdf
    • http://files.templeemanuellongbeach.com/uploads/1/3/0/7/130738883/e7a453102ea88.pdf
    • http://files.fourthelementparanormal.com/uploads/1/3/1/1/131163969/wexokoliso.pdf
    • https://lybio.net
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4667/4337/files/67017204400.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/13936046861.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/kufakifobabine.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/3858226895.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/fewazixusojokotowugiduv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/74160754501.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/23831614985.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/51811492636.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/6240581052.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/sariduxozufibavureratuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/86799131388.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/92709116257.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/fawidebanego.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_off0000519c.bin
c193118d9917d0c9aa4acc95bd81a933d515d7168988c0a963fee90a9d0bc43e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x519C 4680 bytes
font_01_sfnt_off000061aa.bin
1bf0cb0eab4d78280ad03f6a7c8713d48cb304a7b4fabc0c55ff660ae1dae50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AA 14188 bytes

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