Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc7a1dce39faa7a…

MALICIOUS

PDF

43.5 KB Created: 2020-08-20 10:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f571d6a70cbe6b60f50c63bb59bea60 SHA-1: 2f99ba8c19335080cb8875bff5dde67df9c03efa SHA-256: 0dc7a1dce39faa7a271afbf0f0ba141f23c718c3cc6135d3ea4c8bc83b9d93a1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain (ttraff.com). This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to the ttraff.com redirector, which likely serves a second-stage payload.

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=monatomic+ions+nomenclature+worksheet+1
    • http://files.datewithdestinee.com/uploads/1/3/1/4/131408432/4235396.pdf
    • http://zodozafe.poppyandveil.com/uploads/1/3/1/6/131636725/1a830.pdf
    • http://files.bayterracesadoptablock.com/uploads/1/3/1/3/131383889/8599472.pdf
    • http://tokamo.allthingsmel.blog/uploads/1/3/0/8/130873791/natokefowuduru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/administrao_de_empresas.pdf
    • https://cdn.shopify.com/s/files/1/0440/7797/3654/files/81482594079.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/pudefatofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38743570217.pdf
    • https://cdn.shopify.com/s/files/1/0438/9175/3115/files/2020_calendar_printable_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0438/4201/1293/files/89831416576.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/4289379052.pdf
    • https://cdn.shopify.com/s/files/1/0428/7011/2423/files/prefixes_and_suffixes_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6837/5719/files/shl_situational_judgement_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/47848129742.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/jadavuzetazepiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/sowosaturuf.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_off00006ca7.bin
242f7fde4b2d467dc2bb890f440f9b008196adeef3be9a762cc2eed3b4212f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA7 5252 bytes
font_01_sfnt_off00007e72.bin
9de8bd84a03fbfa0cfb421162f4908c466f4de113219e32a229f9bd7adb8d27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E72 10164 bytes

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