Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30241a8919e0324…

MALICIOUS

PDF

58.6 KB Created: 2020-08-05 16:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a462a8862b08a260a278a695e7adf3 SHA-1: 7d52dbb197386ad93749f4e9484a5da1a6e8d4ab SHA-256: d30241a8919e03246be05885b38b4fb3ff9d41525274ae0acc2994426215eec9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links, 'https://ttraff.ru/pify?keyword=factors+affecting+biotransformation+of+drugs+pdf', is identified as a known malicious redirector. The document body itself is heavily obfuscated and appears to be a lure, likely intended to trick users into clicking through the links. The presence of a link farm and a malicious redirector strongly suggests a phishing or malicious redirection attack pattern.

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=factors+affecting+biotransformation+of+drugs+pdf
    • http://files.bolkovac.com/uploads/1/3/2/7/132740805/21f213.pdf
    • http://zidum.buckinjdesigns.com/uploads/1/3/1/3/131383791/samezuxadugepe_popikisumub_wiluvejak_xifeloti.pdf
    • http://files.rossdillon.com/uploads/1/3/0/7/130739510/2055053.pdf
    • http://files.eponafarmkeswick.com/uploads/1/3/0/9/130969772/kobumeluri.pdf
    • http://files.watersafetyandsurvival.org/uploads/1/3/0/7/130776077/xifuwovamux_bozajasisixoz_fomenekivam.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/algebra_2_problems_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/punenef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/67350756264.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rakapadanixip.pdf
    • https://cdn.shopify.com/s/files/1/0435/6653/0721/files/mogunegewexadonuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/2190/0696/files/cognitive_bias_codex_poster.pdf
    • https://cdn.shopify.com/s/files/1/0432/3944/0543/files/wogadipimavirejekujujaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5697/2455/files/ganovukutuxanuvilujotewes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakawefefaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/73148349051.pdf
    • https://cdn.shopify.com/s/files/1/0428/5965/9420/files/muwat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/17404049339.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/46070057517.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/50680556141.pdf
    • https://cdn.shopify.com/s/files/1/0448/2813/1485/files/estados_financieros_contabilidad.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/
    • https://cdn.shopify.com/s/files/1/0448/2813/1485/files/estados_financie

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a692.bin
92a290374ea3b93f8d18a237dc2b75d89832125db9724fa1799794d7b51dc03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA692 5540 bytes
font_01_sfnt_off0000b94b.bin
47bce8da81ad4ed9a168c2d5875b5e2b3ede59464d32d78e5fba1a8397039483		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB94B 10520 bytes

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