Malicious PDF — malware analysis report

Static analysis result for SHA-256 05de3bf536a7c3b5…

MALICIOUS

PDF

43.9 KB Created: 2020-08-05 14:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f312f4a185dffbd5e3b9c09331920992 SHA-1: fc43d4e8852d91298c7bf79ca2ba60d5e4c6e5f1 SHA-256: 05de3bf536a7c3b57171fb6a9157eb516a44d6cd6a00358113a784b16ffdbfa8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, a technique often used for SEO spam or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious destination. The document body, though heavily obfuscated, contains the text 'Citation machine pdf apa' and the malicious URL, reinforcing the lure.

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=citation+machine+pdf+apa
    • http://files.jbschafferartist.com/uploads/1/3/0/9/130969390/5587837.pdf
    • http://files.miamiepoxy.com/uploads/1/3/1/4/131408170/xapuwaj.pdf
    • http://files.clarityautoglass.com/uploads/1/3/1/4/131453894/152156.pdf
    • http://files.hutchingsfraktur.com/uploads/1/3/1/3/131382595/2731127.pdf
    • http://files.ledandminis.com/uploads/1/3/1/4/131407944/fuxemufulawegiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5512/8480/files/70643799858.pdf
    • https://cdn.shopify.com/s/files/1/0432/8770/7804/files/bitsat_previous_year_question_papers_with_solutions_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1665/files/27221275022.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7544/files/45827385679.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/mulasubakoluxitabunudepo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/soxotuduj.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4801/files/67536499155.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xixuvedivikeror.pdf
    • https://cdn.shopify.com/s/files/1/0451/4122/9733/files/la_caida_de_tenochtitlan_unam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5857/files/26277122080.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/senuxofak.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/19990971476.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_off00006239.bin
926bfa7a313985d99df35f1ce5cfef91682a8b63431e9f5b5e007767e641e260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6239 4900 bytes
font_01_sfnt_off000072bd.bin
32f08dde20fe163d95d5df2f5b5968ad8b961978ff9873ca9b78ab5604dfc009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BD 10008 bytes
font_02_sfnt_off000094ab.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94AB 4324 bytes

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