Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cf3c2193f1ec20…

MALICIOUS

PDF

32.5 KB Created: 2020-09-17 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edba92b373d185cf7b4f04fb9b276d26 SHA-1: e3872681ca2f6b45c00db47373f05d736eaadcfc SHA-256: 89cf3c2193f1ec2058ef3e6c9a92b127b1cf372180574f28bfa120928c0c8eeb
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.link/wix?keyword=unit+3+right+triangle+trigonometry+answer+key`. Another critical heuristic identifies this as a PDF SEO link farm, suggesting a large number of links are present to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=unit+3+right+triangle+trigonometry+answer+key
    • http://files.cgcpoems.shop/uploads/1/3/2/7/132740307/5461417.pdf
    • http://jadixem.jillbradburn.com/uploads/1/3/0/7/130776035/tekogonagona.pdf
    • http://jezigoz.anna-needlepoint-pearson.com/uploads/1/3/1/8/131856054/bogug_muzafesez_jukawejizunowol.pdf
    • http://files.vibramhk100.com/uploads/1/3/1/6/131606206/kagowamowiro_vifawudatigugar_kabaxipubasez.pdf
    • https://cdn.shopify.com/s/files/1/0462/2640/7575/files/mudugugozonedel.pdf
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/76605952422.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/88503934142.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4730/files/63217279444.pdf
    • https://67f016d6-d126-480f-84bd-48ff53bc4a3a.filesusr.com/ugd/c068f8_bb1665c581cd4a68a02d26427de1f919.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0436/2413/6864/files/musomegepuduwafemipud.pdf
    • https://cdn.shopify.com/s/files/1/0436/4628/8025/files/57355487923.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_off00004173.bin
3edf1ad2210d87f49d0a84ce70a7d7d112f5704cb3fdf821d033abacdbbda5e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4173 5512 bytes
font_01_sfnt_off0000541e.bin
bcabd2111415754b091848f440b38d59316751f92fc36a91d6d12cad3ae2160e
pdf-font-stream PDF embedded font (sfnt) at offset 0x541E 9668 bytes