Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fffd7c210a8a373…

MALICIOUS

PDF

73.7 KB Created: 2020-08-05 07:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a52e7de06bc678eb29140c25ec90fe SHA-1: 7a4e8b186c24cf351cf1698c641659f919c4d66b SHA-256: 2fffd7c210a8a3732b6caa72050cccac2267363457567ab76830132345e7b351
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for 'Ignou mcom assignment 2020 20 solved pdf'. The document body is heavily obfuscated but contains the same lure text and the malicious URL. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. No scripts were extracted, limiting the analysis of further payload delivery.

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=ignou+mcom+assignment+2020+20+solved+pdf
    • http://files.pauline-west.com/uploads/1/3/0/8/130874620/94f8f676a.pdf
    • http://files.tvnami.org/uploads/1/3/1/1/131163943/tagovirid.pdf
    • http://files.airconditioningcambridge.co.uk/uploads/1/3/0/7/130775286/napuwuzoduzu.pdf
    • http://files.keystohopecounsellingservices.com/uploads/1/3/2/3/132303329/0e4f42a5e40ef1.pdf
    • http://files.christinesjourneys.com/uploads/1/3/1/3/131398084/91490.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/rain_bird_esp_modular_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/eq_blacksmithing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0438/0504/8994/files/71310806391.pdf
    • https://cdn.shopify.com/s/files/1/0434/1039/1207/files/ralube.pdf
    • https://cdn.shopify.com/s/files/1/0438/3493/3398/files/59816835111.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/87130905764.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/wizard_s_spell_compendium_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/xebutubituginikisu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/naxifegusugufusoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6599/files/islamic_calligraphy_art.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_off0000d8eb.bin
4da9eb18034ef64e831e064df5784e41f847435b79783e2f7be96dde2b3e12d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 5652 bytes
font_01_sfnt_off0000ec26.bin
4d5b12cd9e0e8d901c67558d145abe01702eab267c1ba865c0753fa8c49e8c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 14388 bytes

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