Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b678fba8387c7cf…

MALICIOUS

PDF

35.2 KB Created: 2020-08-29 23:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f273dbf881024fe52cd61c0727819082 SHA-1: 39a8c60d0fccbcdd805a3556683b01c1f498cbb7 SHA-256: 8b678fba8387c7cf3baa1b4bbfecc23e7cff74b6e4ae553c7bf849e5492d0a0f
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a large number of embedded links, including a critical finding of a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=john+cougar+john+deere+john+316'. The document body is heavily obfuscated but appears to contain similar URLs, suggesting a link farm designed to lure users to malicious sites. No scripts were extracted from this sample.

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/wix?keyword=john+cougar+john+deere+john+316
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/juvumenura.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/enciclica_centesimus_annus.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5907/files/fikoxusivutusuradelu.pdf
    • https://static.usrfiles.com/ugd/3649d2_ed754732fbe041678001f01dc167facc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6dc46405b074502859cef609ce0d915.pdf
    • https://static.usrfiles.com/ugd/f0e51d_54a29dd0256e46da89aaccfd51393f8a.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/99853754145.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/zuvujorizog.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/43681109061.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/byousoku_5_centimeter_sub_indo_480p.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7972/files/pidovigefiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/candide_voltaire_free.pdf
    • https://cdn.shopify.com/s/files/1/0459/7176/7463/files/gamolaveperekubaba.pdf
    • https://cdn.shopify.com/s/files/1/0438/4456/7197/files/fokodojoluzizujujapazip.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/sofowazafibivukonox.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_off00004c54.bin
4e115e9529335d14d68008ef573f13111f33d0319e61b97cc0b6c79675ed8ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C54 5428 bytes
font_01_sfnt_off00005ec2.bin
8b2f1b361b4571788e2db5ab46b4d1238dd738ae48794a98590801b4aaa440f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC2 9688 bytes