Malicious PDF — malware analysis report

Static analysis result for SHA-256 12321c3446d0893c…

MALICIOUS

PDF

48.9 KB Created: 2020-08-22 15:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe881e3f2ce2ffa16e89d1b74b23938e SHA-1: 26406997b4aae40539cc2530afea4e943b9cc3e2 SHA-256: 12321c3446d0893c44b6225e6c39f957de8b6b58f59ae462ec7ceebfe9fe4a17
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 external PDF files, suggesting a link farm or SEO abuse tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify. The document body, though heavily obfuscated, contains a reference to the same malicious URL, indicating an attempt to lure users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=evaluating+expressions+math+worksheets
    • http://vosuxenes.endofnovelty.com/uploads/1/3/1/1/131164394/8d0be05d6860.pdf
    • http://budusini.davidwanderart.com/uploads/1/3/0/7/130775918/jalunis_lojetofuj_nexede_piwewoger.pdf
    • http://files.wordsbymapson.com/uploads/1/3/1/8/131856991/897497.pdf
    • http://files.funelteacher.com/uploads/1/3/1/4/131482968/sizuloka_botavefefugoro_fejowelepibide_rajozojamifibig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5359/6324/files/kiposevowanibido.pdf
    • https://cdn.shopify.com/s/files/1/0432/2040/2337/files/56013110377.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/jinejivem.pdf
    • https://cdn.shopify.com/s/files/1/0435/8445/4817/files/rosowuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/6872/7194/files/graduation_invitations_templates_free_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2755/files/keralutisadisidebajoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/56729139597.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/xezobamux.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/votufukosobokawijanitomad.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/49293598043.pdf
    • https://cdn.shopify.com/s/files/1/0438/2595/4973/files/31962984711.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/tujaga.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_off000072bd.bin
14d4da66e83bbed395667dcfd7405c27e82aee251489f028defe5829ba7edb4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BD 5356 bytes
font_01_sfnt_off000084de.bin
951ac1d99a2fc76071f3bfbe9c82d9724907b4da341174916edb74d2da83d692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DE 10456 bytes
font_02_sfnt_off0000a8a8.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A8 4324 bytes

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