Malicious PDF — malware analysis report

Static analysis result for SHA-256 771d40c0dc284e3e…

MALICIOUS

PDF

47.3 KB Created: 2020-08-06 06:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f385b9be82eb7fd913c9db11100c4079 SHA-1: 10cbd8ee1f2ceb4a6b72a7b4940ff56c8036d445 SHA-256: 771d40c0dc284e3e5e667b560b6bc36687229a3a85ce0da847e3e4efb32f84fe
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to `https://ttraff.ru/pify?keyword=ncert+biology+class+12+notes+pdf+free+download`. This suggests the document is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The presence of numerous Shopify-hosted PDF links, while some are benign, indicates a tactic to obscure the malicious redirector among seemingly legitimate 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.ru/pify?keyword=ncert+biology+class+12+notes+pdf+free+download
    • http://files.sydneybroadaway.com/uploads/1/3/1/8/131872087/e029277647ee.pdf
    • http://files.evolutiondance.ca/uploads/1/3/0/7/130775518/papakejifem-gaviri-fefifiruta-lovuru.pdf
    • http://files.soeasyofficial.com/uploads/1/3/0/8/130874524/f1fa3.pdf
    • http://dowejosa.lagrangebennac.com/uploads/1/3/1/3/131384401/rumijotov_lutom.pdf
    • http://files.hydrologicsportfishing.com/uploads/1/3/2/6/132680986/5411417.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/50870977522.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/53053139884.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/54466525515.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96280370261.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/transformers_rescue_bots_season_4_episode_26.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/pcsx2_cheats_pnach.pdf
    • https://cdn.shopify.com/s/files/1/0433/9521/9623/files/kovavusuzopisi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/rixubawax.pdf
    • https://cdn.shopify.com/s/files/1/0437/1048/0533/files/45517144143.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/nivuzomovujoji.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e58.bin
98b134cf0f76b99ef1e834dc60d4d6b7712b65e31630b6c5938f197ad0287608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E58 5600 bytes
font_01_sfnt_off00007188.bin
05b418425aed589d8de36ce155d0edfe44cb51efa56c3551391daa1842437f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7188 10448 bytes
font_02_sfnt_off00009547.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9547 4324 bytes
font_03_sfnt_off0000a348.bin
bb965ea0515e7499bb47638dd5c820c8824ea93d586ac0d8f4a8f758a0d32bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA348 3060 bytes

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