Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9efb4683c5b9f98…

MALICIOUS

PDF

32.5 KB Created: 2020-08-15 00:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee93b808f011d863e76c842989142389 SHA-1: 2a8cc1f7f20b70b549b8e65abdda3d11b060353f SHA-256: d9efb4683c5b9f983d44f087417ad167b78cbea50cc69da971295de3624abba8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, a common technique for SEO poisoning and redirecting users to malicious sites. The primary redirector URL, https://ttraff.com/pify?keyword=rainy+day+janel+parrish+piano+sheet+music, is flagged as malicious. The document body, though heavily obfuscated, contains keywords related to piano sheet music, suggesting a lure to attract users to download potentially harmful content. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=rainy+day+janel+parrish+piano+sheet+music
    • http://xufuj.savorfoods.ca/uploads/1/3/2/8/132815933/jusujutemitedazoxek.pdf
    • http://files.avicraftwool.com/uploads/1/3/0/8/130874278/1a8f3.pdf
    • http://files.navedbakali.com/uploads/1/3/2/7/132740594/rumizivixa.pdf
    • http://jubuzake.divotees.co.uk/uploads/1/3/1/3/131384605/ed5ff1b8316ff.pdf
    • https://cdn.shopify.com/s/files/1/0437/4619/7653/files/65569251895.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/tidusiferezegarufes.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/vowusakavejaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9164/files/78603749682.pdf
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/75679665436.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5222/files/milogefo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/97159598850.pdf
    • https://cdn.shopify.com/s/files/1/0437/9348/1889/files/3572292881.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/tubomasovesowolojujun.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/jegolojutuzajiwef.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/tutorial_inventor_2020.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000042c6.bin
16e61d5b501cfe39a2a10d32335196a3fa515719e3052c9e0d05e3a5f2987c5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x42C6 5496 bytes
font_01_sfnt_off00005553.bin
b42f08654e043c35c86eb02c4fd9df05868d8a0bb6eb087c468d276341298b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5553 9280 bytes