Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e3e9cc704d12c5…

MALICIOUS

PDF

38.0 KB Created: 2020-07-30 18:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7117892006e1e0c434b7012a8cefad5d SHA-1: 5f02e39758025ee6e0ae138a7e671918e0a7feed SHA-256: 81e3e9cc704d12c522570c3a8c4056610303f31e8e55d84c0872f87a1c0aa9ab
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) and other external PDF files. This suggests an attempt to manipulate search engine rankings or direct users to malicious content. The ML classifier strongly indicates malicious intent.

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.cc/pify?keyword=biochemistry+vasudevan+pdf
    • http://files.fredhansenre.com/uploads/1/3/0/7/130738806/f996dc94b2.pdf
    • http://files.saltwaterandseaglass.com/uploads/1/3/0/7/130775084/rumorur-giduzerumerot-lurapazo.pdf
    • http://files.aohbucks5.com/uploads/1/3/0/9/130970004/buketurudiro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/33037647903.pdf
    • https://cdn.shopify.com/s/files/1/0435/3225/5392/files/katuwufosedoxokinim.pdf
    • https://cdn.shopify.com/s/files/1/0438/3208/2594/files/kokujebapoturupe.pdf
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/84631652168.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/73508535400.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/92715782061.pdf
    • https://cdn.shopify.com/s/files/1/0431/2206/5557/files/rewurenemiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2947/1130/files/15008997875.pdf
    • https://cdn.shopify.com/s/files/1/0437/8705/9362/files/najusagevugikexugefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/tifaxifaliwemutin.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/50916148669.pdf
    • https://cdn.shopify.com/s/files/1/0434/2644/7525/files/94214361673.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/xunoguxonabapara.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_off00005714.bin
89664be7ebe82bf0db2be911ff37eba0ab57392f2aba2227b23d853e98c5f4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5714 5456 bytes
font_01_sfnt_off00006981.bin
e4e2d76fc1079ee71d36a1a1314c39af36dabf141c43f2a2f48c0d8a5e164f16
pdf-font-stream PDF embedded font (sfnt) at offset 0x6981 9828 bytes