Malicious PDF — malware analysis report

Static analysis result for SHA-256 768dfff2f8b71057…

MALICIOUS

PDF

56.8 KB Created: 2020-08-07 10:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 025d750d0662e93278c6f909e12d684f SHA-1: 257e1a8df115835163b37b1089e226b137fe47f6 SHA-256: 768dfff2f8b710577ee876764af852dbc50904c77fe005385ba08a218bf357b1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to external PDF files, a technique often used for SEO poisoning to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=aneurisma+de+la+aorta+tor%25C3%25A1cica+pdf'. The document body, though heavily obfuscated, contains text related to 'Aneurisma de la aorta torácica pdf', suggesting a lure to attract users searching for medical information. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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=aneurisma+de+la+aorta+tor%25C3%25A1cica+pdf
    • http://files.chinapivotsource.com/uploads/1/3/0/7/130776728/3768861.pdf
    • http://wufelat.payc.ca/uploads/1/3/2/6/132681579/gunenosom.pdf
    • http://files.growwithmehomechildcare.com/uploads/1/3/1/4/131406744/finigan_xaputovatixabi_fiwexo.pdf
    • http://files.eggdrizzle.com/uploads/1/3/1/4/131453061/lorimalamusirixisul.pdf
    • http://xijunu.skiistowest.com/uploads/1/3/1/8/131871699/bedolopawuja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7245/4807/files/19034202071.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/dumugigoduxodug.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/tixifuvotawuzakafib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/31038956778.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1407/files/minecraft_medieval_farm.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9068/files/sajudogokexejeluwidu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8341/5204/files/cute_review.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/dupenemibavujonusubegul.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/ruvejejolusuwurimufijeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/1312/7844/files/lawedumivagiwusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/19442815018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fd4.bin
d649a289dd24f4ed79a23eab2e2828f8035bd45971fffd9cc0020aacb4a0415b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD4 5404 bytes
font_01_sfnt_off0000a189.bin
ea9e6bb7ffc52dbfd0c0d93375b46e952b3a7b75ea2cfcc5d9a9331cb1d4d9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA189 11164 bytes
font_02_sfnt_off0000c580.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC580 4324 bytes

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