Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a36004497f27362…

MALICIOUS

PDF

55.4 KB Created: 2020-08-30 09:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2858b5ec25e5fd03377d7a5dcf9cdd2 SHA-1: 2d0b318931d5c81b1a1a5dd4a81c74d3669c6e44 SHA-256: 6a36004497f27362c1020101cdc1a6c1bb5a49b77be9e8ffb5e9271e731b532a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains URLs pointing to what appear to be SEO-optimized PDF link farms hosted on Shopify, suggesting a tactic to distribute malicious content or lure victims. The ML classifier also strongly indicated 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/wix?keyword=ap+human+geography+unit+1+vocab
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/xazenitaduwikuxoburux.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/berrien_county_jail_inmate_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/3334/6719/files/diet_planner_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/25889147405.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/12515427801.pdf
    • https://static.usrfiles.com/ugd/b8c837_41e8145f2cca49a898bf42a3af490ec6.pdf
    • https://static.usrfiles.com/ugd/07e02c_79efdefd32a14f44981592c78830c48a.pdf
    • https://static.usrfiles.com/ugd/e4a001_8b562684961e420dad8f0203b3f86458.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7721a74e7c04820b2f17953fdbb5f10.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_dda98b87af304d06b0ee5183d6014367.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/kuzajatojokipir.pdf
    • https://cdn.shopify.com/s/files/1/0472/2897/7317/files/as9100_internal_audit_checklist_free.pdf
    • https://cdn.shopify.com/s/files/1/0441/2994/3704/files/advanced_excel_charts_and_graphs.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000836f.bin
c8ef25d486dd72be9f6114e865e74c034e5392e6ebebd824c15f777fe9a67fb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836F 5480 bytes
font_01_sfnt_off00009601.bin
821decd5e81ba2b07bdc3edd31889f923f2ec60f55e4e0492d27513eb3a06026		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9601 10564 bytes
font_02_sfnt_off0000ba19.bin
5ec139a263af45d7cbac1bc1a000173eb4e7f97797aba0f35ce2e37505b4886e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA19 16116 bytes

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