Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd4a30d55722ee4…

MALICIOUS

PDF

44.6 KB Created: 2020-07-25 14:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 948325c28c948ebc75620fbf02e45111 SHA-1: 18a5ccc23b5c12d6f98fea854d7d95069797609a SHA-256: 5cd4a30d55722ee485f2669efae38489a01e6f7681673a6825a840bdc00b2e63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to a song title and the authoring application, suggesting a lure rather than legitimate content. The presence of a link farm points towards SEO manipulation or a distribution mechanism for further malicious content.

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=let+it+go+video++badshah
    • http://files.fathomworx.com/uploads/1/3/1/0/131070751/sepanom.pdf
    • http://files.completetaxservices1.com/uploads/1/3/0/8/130814858/wefin.pdf
    • http://files.shunwen-pen.com/uploads/1/3/0/8/130813764/8244715.pdf
    • http://files.borninabarnminiatures.com/uploads/1/3/1/1/131164157/d7f3daf101da380.pdf
    • http://files.elocuentecollections.com/uploads/1/3/1/4/131407737/jamesimuvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/gazevoger.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3681/files/wifuximezenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/80310242394.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0430/3188/8035/files/rebel.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/foluzogoji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/fipanamofusixenora.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9267/files/tijiwijotuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/79754987481.pdf
    • https://cdn.shopify.com/s/files/1/0434/0780/2531/files/8035324002.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sotuxinonuwirumedubisaz.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_off00007330.bin
1daad11178744df31be6dca9c032b3384414d6b3d9c16aee5ce9d09a69b57abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7330 4784 bytes
font_01_sfnt_off0000838b.bin
e48f70e66fc9a5e89fcd88a2342ae1062edb94acc09f317678097bf6aa89825a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838B 9896 bytes

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