Malicious PDF — malware analysis report

Static analysis result for SHA-256 02617afd80044633…

MALICIOUS

PDF

42.9 KB Created: 2020-08-07 09:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49c794bd6d2ea64e0c9938996e6849c0 SHA-1: 8cd84f96e2cbdd8eb22fcd9c6334588fdea92b6e SHA-256: 02617afd80044633eab107b21ca20cb5b8ffd7c7574c8fca4550ba07c619510e
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'english grammar pdf class 9' and the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=english+grammar+pdf+class+9
    • http://files.waypointwes.org/uploads/1/3/1/4/131408204/pudado_bezirukef.pdf
    • http://files.lknailsandbeauty.co.uk/uploads/1/3/2/6/132681938/wovaxale.pdf
    • http://files.youglowgirlva.com/uploads/1/3/1/8/131856574/bideluzokaxukut_bisub_vaburagudipesal_gapibi.pdf
    • http://files.5keysyoga.com/uploads/1/3/0/8/130813965/3487277.pdf
    • http://files.key2evolve.com/uploads/1/3/0/8/130874318/zasabuxemer_xawapikiguromik_balasoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7964/7900/files/latobokaxotumixudagaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/6575/3241/files/bitdefender_gravityzone_advanced_business_security.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7206/files/auditing_assurance_services_a_systematic_approach.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/sofumujivutet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/68041215076.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0966/files/42052422131.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/12652210679.pdf
    • https://cdn.shopify.com/s/files/1/0429/5193/4108/files/computer_troubleshooting_beep_codes.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/taxarumevevoditonufem.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/nexikoronenegepekixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/61725626391.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0486/files/vekejogonatarozevip.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_off0000669f.bin
1ee5f47df704d462cc8dbb8cab8b44493b1b038a7151adffe6ec9b4b07a246cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669F 5684 bytes
font_01_sfnt_off000079cf.bin
5e24094d63eba615177f325bb859fd63a045dbec4f6d1d89813c06df13b6e202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CF 10852 bytes

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