Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bdfb3f296db4b2…

MALICIOUS

PDF

45.7 KB Created: 2020-08-12 00:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faaa11d7938a5f74d303503a098c9676 SHA-1: 48b9be9f77084598367ffeb34518d2cc0c470e51 SHA-256: 58bdfb3f296db4b28d1abcf2489f1f2bb9d707734115734e29a3d0fc426e0d29
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text referencing a 'scantron answer sheet' and includes the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=sample+scantron+answer+sheet+for+let+pdf
    • http://riwemu.celinehavard.com/uploads/1/3/0/8/130814011/1095579.pdf
    • http://files.oskargudmundsson.is/uploads/1/3/0/7/130775346/dibunomugan.pdf
    • http://files.nalg.org/uploads/1/3/0/8/130873872/1247346.pdf
    • http://files.deliveredvessels.org/uploads/1/3/1/4/131438460/2ed05f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/best_place_to_play_spades_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tutokufumetuja.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/tisunutevavuguxakizapofil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0431/2753/7828/files/paxegapukuwupesazatuvena.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/gipasezevobewizegud.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/47015031367.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/t_m_apostol_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/708_296_4502.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2277/files/15435495271.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46496449222.pdf
    • https://cdn.shopify.com/s/files/1/0440/3508/0342/files/bivupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4680/5408/files/hot_wire_anemometer_sensor.pdf
    • https://cdn.shopify.com/s/files/1/0429/0134/0319/files/498864328.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4703/files/36453475618.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e4.bin
ffddbb39595a7817ff91a49e96c776a10073ecaab74907708b60f3b15d12cbfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E4 5332 bytes
font_01_sfnt_off000076d7.bin
55cce65a043e1740a6bd52ad3ee5735bc55d2d1fa4b63b86bfc8da2f9d566b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D7 10772 bytes
font_02_sfnt_off00009b65.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B65 4324 bytes

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