Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4311e3a8d3db84…

MALICIOUS

PDF

48.2 KB Created: 2020-08-25 03:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0fbe3153187277e7d9ff11e9027e30d SHA-1: 3a0019bfb91b69ad80e9e749d181e44c9e24e93b SHA-256: 6a4311e3a8d3db84937c757dd666b2f68a732d8c749d18de07c1c941dc3e4477
162 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large external link farm. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=barely+lethal+2015', which is also listed as a malicious redirector. The presence of numerous Shopify-hosted PDF links suggests an attempt to create a link farm for SEO manipulation or to host a large number of lures.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=barely+lethal+2015
    • http://files.emileescreations.com/uploads/1/3/0/7/130739081/wekemabu.pdf
    • http://files.vibrant-energies.com/uploads/1/3/0/8/130873907/nomadu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/23468607483.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7572/files/nefugobufugeniruxivuvir.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/66560514331.pdf
    • https://cdn.shopify.com/s/files/1/0435/5365/2895/files/secretary_cover_letter.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8194/files/monster_call_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/96788776150.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/25079530527.pdf
    • https://cdn.shopify.com/s/files/1/0447/2055/4138/files/kinina.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_off000073ac.bin
40499fdcde309fc7cb25b1c1abbce08550dd9d31c7982f85d802acf06069cc5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x73AC 5196 bytes
font_01_sfnt_off00008560.bin
5676f0641f171113f0f00533efca958d41a26cd66c25393775b6c0d08ccb43b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 15320 bytes