Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f3a961f04b1bd9…

MALICIOUS

PDF

49.8 KB Created: 2020-08-02 03:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d051a7cfa3dbe2d78d7a9bd5dc4f2fc SHA-1: 22edc374a29f2593ce3a148e51ae71e41c6a13a5 SHA-256: 16f3a961f04b1bd9f44935e53516ffb1bc5f903a9ac5c86007e418ab358dd95a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=latex+document+class', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL and numerous other Shopify links, suggesting an attempt to lure users to external, potentially 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.cc/pify?keyword=latex+document+class
    • http://files.nrchemistry.com/uploads/1/3/2/6/132681783/diloxevixofije_vusaxuletazez.pdf
    • http://files.sfarzoproduction.com/uploads/1/3/1/3/131382243/vogoz.pdf
    • http://files.uticavapors.com/uploads/1/3/1/3/131384335/sitepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/9736/6436/files/1154544286.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/97461269755.pdf
    • https://cdn.shopify.com/s/files/1/0437/5629/0206/files/pink_vissual_pass.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/gutiligapotapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2418/files/95269832775.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/porig.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/46572022042.pdf
    • https://cdn.shopify.com/s/files/1/0439/7511/4910/files/88827345282.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/12353661532.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/fidosoxaxugezaxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/kik_for_pc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007775.bin
fc4e2834d75a8ab0626e4a60c8d05b25df5bd6c357693a2655ca79419036a2f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7775 4832 bytes
font_01_sfnt_off000087ce.bin
4720db05664900789339b4ac69930537a99a3f041017d324fc6ecdef99678f68
pdf-font-stream PDF embedded font (sfnt) at offset 0x87CE 10760 bytes
font_02_sfnt_off0000ac73.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC73 4324 bytes