Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88cdbba43ad0da0…

MALICIOUS

PDF

50.5 KB Created: 2020-07-08 22:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d0efed86cb828ebe64ec056de8de563 SHA-1: 93e43cecbdfe55f250913462373570889a2dfae6 SHA-256: c88cdbba43ad0da03db34969718405a46a3d4e29b25f32b022ddaf963562ac12
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent link, 'https://ttraff.ru/wb?keyword=nsw%20fitness%20to%20drive%20medical%20assessment%20form%20pdf', is identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'fitness to drive medical assessment form'. The presence of numerous SEO-optimized PDF links indicates a potential attempt to manipulate search engine results or distribute malicious content through a link farm. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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/wb?keyword=nsw%20fitness%20to%20drive%20medical%20assessment%20form%20pdf
    • http://files.hlfmgoats.com/uploads/1/3/1/3/131383553/jopaxubesoz.pdf
    • http://files.artdecuivre.net/uploads/1/3/1/3/131380021/afbcc3bcb4e5.pdf
    • http://files.musicatmainstreet.com/uploads/1/3/0/7/130739839/davetuxu.pdf
    • http://files.badmannersesports.com/uploads/1/3/2/7/132710575/a2168853.pdf
    • http://files.practicaladvantagecomm.org/uploads/1/3/0/7/130775838/3691641.pdf
    • http://files.breathewithlauren.com/uploads/1/3/1/4/131437351/424db3.pdf
    • http://files.camdenscrusade.com/uploads/1/3/0/8/130874213/rogutazalow-lijoboxemom-bipoj.pdf
    • https://semukiko.files.wordpress.com/2020/06/sunamiwiguvosumub.pdf
    • https://vudesepof.files.wordpress.com/2020/07/98907752619.pdf
    • https://bobunob.files.wordpress.com/2020/06/21971134472.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008800.bin
e818bc243f76aae864effe763e1aecfe0d184d47786fe4729f468cdcf1d5145a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8800 5208 bytes
font_01_sfnt_off000099aa.bin
633b762f7bf1fdf37a0affa5b75ff7e1b9d08ebbe8b467c34d4740861e3c0346
pdf-font-stream PDF embedded font (sfnt) at offset 0x99AA 10304 bytes