Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37b250e8c22c058…

MALICIOUS

PDF

38.5 KB Created: 2020-08-11 06:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b5fce13ea22dbd0fb03abde005aabf SHA-1: 5455e3d6cbca105d0d2189f773b9118be4524eed SHA-256: c37b250e8c22c0585d33c0e5d379abbad26857567b5dad36a48556138d9cc147
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=apologia+de+socrates+platon+pdf+gredos. While no scripts were extracted, the structure and heuristics strongly suggest the document's purpose is to redirect users to potentially harmful sites.

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=apologia+de+socrates+platon+pdf+gredos
    • http://files.philipthompsonphotography.com/uploads/1/3/0/7/130740118/4cc963.pdf
    • http://files.donnawardlehman.com/uploads/1/3/2/3/132303388/820024.pdf
    • http://rimepilu.wachurchofchrist.com/uploads/1/3/1/6/131606490/ce42d12ab538bf8.pdf
    • http://files.evans-nguyen.org/uploads/1/3/0/8/130874583/bf1c0ac6f2780b2.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/tcs_email_writing_format.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/alter_ego_b1_cahier_d_activits_corrige.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/exercices_d_orthographe_cm2.pdf
    • https://cdn.shopify.com/s/files/1/0438/3513/0018/files/31832605619.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/98541574999.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/utilisation_du_bicarbonate_de_soude.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/66977349491.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/12174343453.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/vasozovaverubon.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/21206006438.pdf
    • https://cdn.shopify.com/s/files/1/0433/0602/5128/files/91139884774.pdf
    • https://cdn.shopify.com/s/files/1/0438/7382/9032/files/troy_bilt_junior_tiller.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_off0000591a.bin
afbf8d4d474340f7f971b9b963d8e59ec6fbd807d1711c5589782e958e6ed50e
pdf-font-stream PDF embedded font (sfnt) at offset 0x591A 5312 bytes
font_01_sfnt_off00006b36.bin
123a4f2686e0dc6078bb75a9866551fd51d364d86c0b5bb6914b125f4c4a282e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B36 9876 bytes