Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6f145e4bc736ea…

MALICIOUS

PDF

41.6 KB Created: 2020-08-22 13:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3a82b0007bd1d5004c634df12944bae0 SHA-1: e1ac9e9321f07cc8e91676805a2bfe1366beb149 SHA-256: cf6f145e4bc736ea8cc6b54d45f0177e07b5366308eb0c8cc5047c0ee5a8afc7
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=inspection+report+letter+sample', is flagged as malicious, indicating a redirection attempt. The document body, though heavily obfuscated, contains text related to an 'inspection report letter sample', suggesting a social engineering lure to encourage users to click the malicious link. The presence of multiple Shopify links, while some are benign, contributes to the overall link farm characteristic.

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=inspection+report+letter+sample In PDF document text
    • http://files.mathandcoding.org/uploads/1/3/2/6/132682829/2507156.pdfIn PDF document text
    • http://mugemak.lapen.org/uploads/1/3/0/7/130776823/2f56126a08a.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/1/0429/3319/0823/files/raxajetiganu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4426/5366/files/virtualbox_ubuntu_18._04.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2215/4908/files/22661183417.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/technology_innovation_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3698/9850/files/bionics_engineering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/dorupevagipitevumiduzigej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/51929399681.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9507/1651/files/gaxivenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/kodowivumezone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/boy_scout_uniform_inspection_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1464/2074/files/prokaryotic_cells_vs_eukaryotic_cells_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/sazefadoparolomaselipo.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 5016 bytes
SHA-256: fcd60ca05c9bdc7675b876a3030f939aca62e3766f9e007e691692aa2f1b38f4
font_01_sfnt_off0000764a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x764A 10408 bytes
SHA-256: 9d13db5445b995c820e0749e8792e4a8d083be5c367a2a89b33eff7efff6b363

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