Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f6eb39c4a4bff7…

MALICIOUS

PDF

42.6 KB Created: 2020-08-09 07:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6c2eaa8f8e056a043490a3cd997321f3 SHA-1: 21b3f4f914624385be06763022039fcc3a08eb83 SHA-256: d5f6eb39c4a4bff78ad884ba97a61e2ef3beced9e68248d07c432cd1354c1b23
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'cassation decision' which leads to the malicious URL. The presence of a link farm heuristic further supports the malicious intent of distributing links.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=cassation+decision+volume+21+pdf In PDF document text
    • http://files.zackbacak.com/uploads/1/3/1/3/131398134/c9574.pdfIn PDF document text
    • http://files.anacmcinerney.com/uploads/1/3/1/8/131871912/1396699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/gudas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/xorubavarinoniroxafob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/girovabawunezaboparurov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/70199709200.pdfIn PDF document text
    • http://tuwujuwu.theraleighwineshop.square.site/uploads/1/3/0/8/130874474/16ae379ab9d9e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/bigoxepiwotusedemoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/sojuvogop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3742/3776/files/19198549363.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/87507149260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/49143215830.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3772/7637/files/83868509930.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46A0 13756 bytes
SHA-256: fb21640f4c278811f699712d19c9f45137fdc1fdfa6a777ec9ebe62cfef61254
font_01_sfnt_off00006b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B51 5356 bytes
SHA-256: 50f2ba1623913df5d763c82e81a733cf3a5093cf673a8ef8a4ac78589e69d13b
font_02_sfnt_off00007d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D83 9324 bytes
SHA-256: c44154a1e8a61b762c2f6d673110c47aaadf3bdfa9a14754e4d2f7e5cb535c3c

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