Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f71b8b98591266c…

MALICIOUS

PDF

40.9 KB Created: 2020-08-08 12:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eef82bf01918a0eb3912f98a4e8fc6b6 SHA-1: b505889dceadcd73a61bcfbbe8e0ac84a62077bc SHA-256: 0f71b8b98591266cbff93e912324b5256bbbdf3c94841e4c53034e0a836490bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. The document's content, while appearing to be a calendar, is likely a lure to encourage users to click these links. The presence of numerous external links and a malicious redirector strongly suggests a phishing or malware distribution attempt.

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=calendrier+2020+et+2020+%25C3%25A0+imprimer+pdf
    • http://files.tanawanhandycraft.com/uploads/1/3/0/9/130969061/9083761.pdf
    • http://files.mysuzannahsmith.com/uploads/1/3/0/9/130968906/wulaxemotozevim-konefava-wofujelebafoj-sudiwimezar.pdf
    • http://files.architecturalglass.org/uploads/1/3/1/8/131856068/bbc6fbfa33d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/tafamepilujum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/rv_repair_and_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/74404684030.pdf
    • https://cdn.shopify.com/s/files/1/0451/0282/5625/files/certificado_medico_centro_de_salud.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/jijijajogemopeseremoruvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/zaderalexijegu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/74234546939.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7211/files/49030579075.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/14491320868.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/95842711075.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/simple_classroom_rules_for_high_school_students.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_off00005cd0.bin
29c668783717173a8afb6ef9261c18590612a55a578a4e799936f9d6fd9b1c6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD0 5420 bytes
font_01_sfnt_off00006e94.bin
b8d40090be325f101f3ec154cce683965994d49d44c0a3cadceab59ce6d216fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E94 12048 bytes