Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a2bc6473dd9347…

MALICIOUS

PDF

40.7 KB Created: 2020-08-08 19:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ebc94159911a3daf0c875f06f3ef8d SHA-1: 4515adb4f67cf2e92e7a4848281c09f365c6cbd2 SHA-256: 38a2bc6473dd93476623f0711c143fd18912694c5946b6dcd4973c6f5f9264da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=pathogenesis+of+hepatitis+b+virus+infection+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious sites under the guise of providing academic or informational content. The ML classifier strongly supports the malicious nature of this PDF.

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=pathogenesis+of+hepatitis+b+virus+infection+pdf
    • http://files.manuillmusic.com/uploads/1/3/0/8/130813827/dufatow.pdf
    • http://files.sfmariposakids.com/uploads/1/3/2/6/132695492/jukepefel.pdf
    • http://files.dancewellcentre.co.nz/uploads/1/3/1/8/131871602/pezezifibelidipu.pdf
    • http://files.ipksportsbetting.com/uploads/1/3/2/6/132696016/nujurigup-loluxovap.pdf
    • http://files.learningspiritenergy.com/uploads/1/3/2/3/132303024/kajademimapotagof.pdf
    • https://cdn.shopify.com/s/files/1/0433/6330/3575/files/pevazogowilevowi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/advantages_and_disadvantages_of_geothermal_energy.pdf
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/39855957315.pdf
    • https://cdn.shopify.com/s/files/1/0431/9032/1313/files/16102940692.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/jejupinapodunaso.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/75304774973.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/79173587553.pdf
    • https://cdn.shopify.com/s/files/1/0429/5563/6889/files/english_speaking_simple_words.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/accounting_basics_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/60819141994.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/94765666155.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/71602459879.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5694/files/fanoxalagovakerazibod.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_off00006119.bin
4d1a5768a84830e9aba21b28740cef4df4e35a2e02978a36c4696eddd4b21d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6119 5584 bytes
font_01_sfnt_off00007419.bin
548b797b1c089450f56ee22487a07dfb5df7dd5515adb98f6cc7b8a88b3175bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7419 9736 bytes

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