Malicious PDF — malware analysis report

Static analysis result for SHA-256 8116e83dce90e000…

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 19:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fda207b1a13c9c0f15e3506518cdb1a SHA-1: 1c7bde043ed9c8e7dd62f0f594870e2ebcb410ff SHA-256: 8116e83dce90e000d216bec0443d098ed7dcd974ac09e622ffddc816db5e763a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=windows+10+disable+hibernation'. This suggests an attempt to direct users to malicious content, likely for phishing or malware distribution. The presence of many external links, including benign ones on Shopify, indicates a link farm strategy. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious redirection attack.

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.ru/wix?keyword=windows+10+disable+hibernation
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/gifiga.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/48520854539.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/nofog.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/guide_to_intermittent_fasting_16_8.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/78688624660.pdf
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/properties_of_benzoic_acid.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/disirum.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/kexipelimibidifofomiw.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_2a3c9ca3efa14878962f7d3e12baf1e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc7a68105eab4662814b48350b85eaa7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6666bf03ee0493fb4b4ca5e2b13e010.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_off000057ea.bin
7b9672411b6cc8d709c40c293e202d1b4d88be0720956ffc79ae615485178b05
pdf-font-stream PDF embedded font (sfnt) at offset 0x57EA 5140 bytes
font_01_sfnt_off00006965.bin
ee0993f971fdce9e1cc1bf1ea0fe4dac273204f8a95c9623a34a22a17800cd95
pdf-font-stream PDF embedded font (sfnt) at offset 0x6965 10012 bytes
font_02_sfnt_off00008b76.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B76 4324 bytes