Malicious PDF — malware analysis report

Static analysis result for SHA-256 74be729ac3023613…

MALICIOUS

PDF

41.6 KB Created: 2020-09-17 06:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00d1cfed8b060ee527d589187c1bc3dd SHA-1: a1529b1707e9aa4786c45a45c22968ea15cc0cd7 SHA-256: 74be729ac30236136278b425c00d2318cbea88e9544acf5c40637a4f890bd197
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the link farm heuristic point towards a malicious intent to redirect users to potentially harmful sites.

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=xdm+guide+rod+wear
    • http://files.marryingbipolar.com/uploads/1/3/0/9/130969758/3592398.pdf
    • http://files.accfinsoftware.com/uploads/1/3/1/4/131482907/415182.pdf
    • http://kuruveg.morebeetsplease.com/uploads/1/3/2/8/132815828/56425a3c53c50.pdf
    • http://files.eytspartans.org/uploads/1/3/2/8/132814996/fusakupafogureb_rosama_somufivijaso.pdf
    • http://files.bristol.co.nz/uploads/1/3/0/7/130775728/2055644.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5767/5421/files/hyrule_warriors_wiki_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/vasefemoritufasixutifa.pdf
    • https://cdn.shopify.com/s/files/1/0483/9292/9437/files/xojapobekule.pdf
    • https://6b86eb0d-40a6-4650-ad95-9c06ac74fd8e.filesusr.com/ugd/d216cb_38bb6753f7f84f379de7d504b410fbb5.pdf?index=true
    • https://49eed056-1ffe-4e99-aa88-e6ddad566939.filesusr.com/ugd/c068f8_82e7a2271f204ae7a8f73d1bd40a4d93.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0462/8119/5680/files/62129436084.pdf
    • https://cdn.shopify.com/s/files/1/0434/6645/7254/files/betternet_premium_apk_pc.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_off000061e9.bin
292e4cc9bd7973a7308c076a1a00d63a5315290d6a94046ad3d24db7c02e1483
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 5004 bytes
font_01_sfnt_off000072e5.bin
bec298463306d1a5e4bd6a04273167735f8e7794cceb181b86b7c6b019b882c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E5 11152 bytes