Malicious PDF — malware analysis report

Static analysis result for SHA-256 7135c2e5e736c786…

MALICIOUS

PDF

39.4 KB Created: 2020-08-30 14:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5283a85ded857ea4f9701aaef40b700a SHA-1: 5130819d5edcd0c08e372b3d2db17e873bdb54ca SHA-256: 7135c2e5e736c7860f82fa63b0e42bbbeb2b619d3c9e17c3d0c935478f5272fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent link directs to a known malicious redirector infrastructure at `https://ttraff.com/wix?keyword=vlc+boucle+entre+les+points+a+et+b`. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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.com/wix?keyword=vlc+boucle+entre+les+points+a+et+b
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c0fca2_d7b80db8cc694f6387d947a66240688e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb83d719e33b44a686e30bb87ddaa843.pdf
    • https://static.usrfiles.com/ugd/32777b_cf7b45fe31f34433b1c8dd41b0e0bbbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_37dda59325b84745b1f6d33c61e9f468.pdf
    • https://static.usrfiles.com/ugd/b8c837_997ae683a9c349bf93a1d04be82e9c43.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fisebupujavilugux.pdf
    • https://cdn.shopify.com/s/files/1/0459/2474/5367/files/bugojabodamisapezedinarov.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/76040817721.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/7609922086.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/netomaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8243/2160/files/82692517494.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.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_off00005a6a.bin
8c69b5e7414b73e72354194449560496209fcf77c26889babb7aa05c68f1ab6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6A 5032 bytes
font_01_sfnt_off00006b89.bin
02dbe06791fcdab08937a547e59c14ce4beeb0fb611bd2ab22245ecd474b291e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B89 11112 bytes