Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c27c98d167d2f7…

MALICIOUS

PDF

49.5 KB Created: 2020-08-20 01:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f6fc68330ec8ee18a3f04ec179f8c9a SHA-1: 3d9b8a49b76fa57bac845c7ed0f41e0a7945f613 SHA-256: 10c27c98d167d2f7ecdaea515a2c6edd16f82a2d5433add70b2f348b23893268
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially garbled, suggests a lure related to an 'audit report'. The ML classifier strongly indicated maliciousness, and the presence of a redirector points towards phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the 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.cc/pify?keyword=audit+report+format+of+llp+2018
    • http://files.firpoint.net/uploads/1/3/0/7/130775728/9839024.pdf
    • http://files.johncarril.com/uploads/1/3/1/8/131871648/538df21c776093b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/boxexagomodif.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/retroarch_keyboard_controls.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/42962500141.pdf
    • https://cdn.shopify.com/s/files/1/0439/6508/7902/files/93354859172.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/degesupabazikemikot.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/vukakisorik.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/muvaxokuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/31125292626.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_off000083e5.bin
6d7e73c21c933e037aa6b2f3d5f579289825c3ea56e326fdb39126e0e0a83394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E5 5516 bytes
font_01_sfnt_off0000968d.bin
ccd862665540530aa92b4ea54aebb9fda12f15c1d09ce6b9fb6d7455a3143115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968D 10376 bytes

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