Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf3508eacccf8a9…

MALICIOUS

PDF

43.8 KB Created: 2020-08-01 05:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6eda038c088e8f0903f20ba1fd62c0d SHA-1: e8a006dfafa29369cb25b733743a16469f585ca3 SHA-256: 6cf3508eacccf8a94548a8c9f46a9369c1190cdc686ca03111420830bff22fb1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify-hosted PDF files, suggesting a link farm designed to manipulate search engine results or distribute content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=thunderdelve+mountain+pdf'. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the malicious URL, further supporting the lure.

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=thunderdelve+mountain+pdf
    • http://files.globallearningadventures.com/uploads/1/3/0/8/130874451/gixewuvelesa-zonajige-tajobujig-baxadominulo.pdf
    • http://files.mycorporateteambuilding.com/uploads/1/3/2/3/132302978/68c5c659.pdf
    • http://files.nancyhendersonwriter.com/uploads/1/3/2/8/132816036/repelodaki.pdf
    • http://files.jerronjorgensen.com/uploads/1/3/1/4/131407635/1d1c404d1f4d7.pdf
    • http://files.hillcountrymarines.org/uploads/1/3/1/8/131856039/e7d319.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7818/8198/files/97597443299.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/85910264897.pdf
    • https://cdn.shopify.com/s/files/1/0434/4958/1730/files/vevunudipipipawirewepemax.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/72420042032.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9229/files/65789346472.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/87087086976.pdf
    • https://cdn.shopify.com/s/files/1/0429/7470/7868/files/nikifusisowemililerena.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8357/files/wakewij.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/vulew.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/32405398319.pdf
    • https://cdn.shopify.com/s/files/1/0431/6610/5759/files/45314265371.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/95497446457.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_off00006d6f.bin
ea96da70263a0e86bdfca10ad4f9f215a99da3f719ba50ddd0165305abd5575e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6F 5112 bytes
font_01_sfnt_off00007eab.bin
4363307416a0a77a469b1406d0db8707fec0a0f872690747a224bda1a7042709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAB 10304 bytes

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