Malicious PDF — malware analysis report

Static analysis result for SHA-256 84101764feb87717…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 18:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e19f5524e276b5da46b38b57125cc4 SHA-1: fdfc41984783870e3e2f2c3b85c62e870a4d05c1 SHA-256: 84101764feb877172c37dbbba54a410a1418d7d56d3f5ecebcaab8c634bdb28f
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector URL points towards an attempt to lead users to harmful 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.club/wix?keyword=lego+bttf+delorean+instructions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d1edcb8a83c94dfea2c829b95e17ac54.pdf
    • https://static.usrfiles.com/ugd/b8c837_556d75671216464e8d19ef758feb3b20.pdf
    • https://static.usrfiles.com/ugd/b8c837_74b57338578845ef8460befcdf8554ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cb234ad78af4295be5f05ae398bfbc7.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/mathematical_physics_by_ab_gupta.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/femitoravakipivigutajaboj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/aneurisma_de_aorta_abdominal_2020.pdf
    • https://static.usrfiles.com/ugd/b8c837_616489f646b44c4f97f250f1b4d87860.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2ed47b51d8f4aab89b7306997f4a98c.pdf
    • https://static.usrfiles.com/ugd/b8c837_efab7b681d9a43dfa11e5b6b10af5f43.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e29c1580c904fb5afabe02370fb5898.pdf
    • https://cdn.shopify.com/s/files/1/0432/5752/8480/files/exxonmobil_investor_relations_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/7964/7903/files/garebewexuwuwagoxefo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/carcinoma_epidermoide_oral.pdf
    • https://cdn.shopify.com/s/files/1/0432/3547/5624/files/gibukuzaduma.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_off00005784.bin
efcfc657b1ca3a6943f1bba7345a05354a39c919a5507d730894d78fdd33f861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5784 5268 bytes
font_01_sfnt_off0000697f.bin
0ad7716476522c23ea80d295a1e2a538a62fd564e2314c7dcd2c1ddd1b0a633f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697F 10536 bytes

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