Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c749bdc4079182…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 18:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f7b2ceac4cb71c3899028bb238fed24 SHA-1: 23812d9cd04ce3b81797a4f9664dc0552c0f1b15 SHA-256: 08c749bdc4079182bf4c19057998f8f571023f171751d13b60ffb22bc12f943e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including a known malicious redirector at ttraff.ru, and a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, contains text related to 'Framework 3.5 free windows 8', suggesting a lure to entice users to click on the malicious links. The ML classifier strongly indicates maliciousness, and the presence of multiple PDF-specific heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=framework+3.+5+free++windows+8
    • http://files.sfbodyscrubs.shop/uploads/1/3/0/7/130740264/35f3b.pdf
    • http://devobela.reifierentertainmentdevelopment.com/uploads/1/3/2/6/132683459/6100396.pdf
    • http://files.mcauslanmaltinganddistilling.com/uploads/1/3/1/6/131637606/62036b614e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0315/0499/files/jixomiremokodutowema.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/wikexezedel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/gexijunepu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9686/files/44070308466.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/53043378029.pdf
    • https://cdn.shopify.com/s/files/1/0429/8270/3257/files/nafiguvegebi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/pekun.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/jee_main_b_arch_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0440/1197/8902/files/pufidamimafigasokojuwulup.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/29928020642.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_off00006136.bin
c9792322e6fadf0ff5a95f2b03fdda45dc1dc0a38b69e9e0b5ccdb5d2387180d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6136 5648 bytes
font_01_sfnt_off0000746c.bin
8953b76a9be0b14f59681357bd653dea135682334ca28a495a3cc9756f9d438f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746C 12940 bytes

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