Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e19a9c426556682…

MALICIOUS

PDF

43.6 KB Created: 2020-08-15 03:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6dd7e6539aba1e7f9c1f9795939830f SHA-1: 2c26e10fd3bfcd077c286e2ca5267fb8b69f2318 SHA-256: 8e19a9c42655668250d47f84b30c6e494e4c6f74e7694e23ecfca50b9f11a55b
152 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with one primary link redirecting through ttraff.com, a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the document's purpose is to trick users into clicking these links.

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.com/pify?keyword=permitted+development+guidelines+uk
    • http://junanu.hummingbirdmosaics.com/uploads/1/3/1/1/131164424/9954601.pdf
    • http://fejili.serendipitybp.com/uploads/1/3/0/8/130874222/9235060.pdf
    • http://files.cemcaracing.com/uploads/1/3/2/6/132681880/1866966.pdf
    • http://files.londonpoetryopenmic.com/uploads/1/3/0/7/130738778/b68664ccbdb72c2.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/xaguvulepebiporijaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/58808203551.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/design_of_wood_structures_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/university_calculus_early_transcendentals_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/95355177786.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/foradixotobemux.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/lusun.pdf
    • https://cdn.shopify.com/s/files/1/0435/6558/0449/files/52214260416.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/23500577298.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_off00006c08.bin
27146d4a765446c8dde05240829ea64efc11aa96500fc8dc1201c1d2ca7700b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C08 5192 bytes
font_01_sfnt_off00007da6.bin
bdf62d78115c54c3f6401757a4cc9637a66d0575bbdd120ab5338042072077a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA6 10396 bytes