Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c988d44e4328d1a…

MALICIOUS

PDF

48.2 KB Created: 2020-08-28 20:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 565d8046821f972ad2b209f7e2b4d78b SHA-1: 5aac7c586ca24258881aa8c5e9f0e35bd3f586df SHA-256: 7c988d44e4328d1a4b70b2e572806be90b250240e3afbe3588b689eeb7286b0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, many pointing to Shopify-hosted PDFs, designed to appear as legitimate content. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF.

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=reporting+hierarchical+regression+results+apa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/69532404893.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/california_dreaming_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0462/2876/6871/files/ordinal_numbers_1-_100_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/50035563305.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jewepogepavab.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f4a2c07e0b840fabca3136754149fbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b1e24127d5c4175b889c175a960c520.pdf
    • https://static.usrfiles.com/ugd/b8c837_17210462a724451698488763164e7bf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_f38d507272ba4bb5ac3f24534b1883b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_455e295a74104e64b1b901251d27e431.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d6ac805ccef4705aeed88c6bf67e36f.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a0d77b368d467cbf1d346bdddbaac8.pdf
    • https://cdn.shopify.com/s/files/1/0464/9756/2776/files/69498827680.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/kobibewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/beacon_medaes_vacuum_pump_manual.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_off00007f00.bin
ae8dfebe938a95cb7d07075ce177d3473627d98f05240a2ff47456acb7faca17
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F00 5204 bytes
font_01_sfnt_off000090af.bin
6b61bca6def44f566970d368bc2817daaaf8dccd20fee0323f66121f4d95470a
pdf-font-stream PDF embedded font (sfnt) at offset 0x90AF 10244 bytes