Malicious PDF — malware analysis report

Static analysis result for SHA-256 122f50a3c2bfac90…

MALICIOUS

PDF

31.9 KB Created: 2020-08-15 18:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 854c5265f2aa3228fd2053e8653636dc SHA-1: b2001bcec68b1d14c6966a67bbfbcba644dcfdca SHA-256: 122f50a3c2bfac903a994eeabbc583cbfb184ddf83409e29555a839f993d620c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself contains text related to templates and document creation, suggesting a lure to disguise the malicious 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=avery+5260+template+word
    • http://files.rsvpvolunteercaregivers.org/uploads/1/3/2/6/132681824/navate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0527/0437/files/pukizogatokifagogemewuted.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/48772536602.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/86288220417.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/export_calendar_from_outlook.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/29656347614.pdf
    • https://cdn.shopify.com/s/files/1/0432/7623/9014/files/90532157582.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/12042553013.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/wunilijaxum.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_off00003f5c.bin
3ad43d3aa2b0c39523a31564410538616d91925ec77388741435378089916795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F5C 5720 bytes
font_01_sfnt_off000052e2.bin
9890916f30fd13108ad3bdc1037e077f1be77e44612c66ea55863758125b7924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E2 9528 bytes

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