Malicious PDF — malware analysis report

Static analysis result for SHA-256 c621ef53cbcb2d34…

MALICIOUS

PDF

55.7 KB Created: 2020-08-23 00:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3cfc903bba910a5f51cbac46e7309d58 SHA-1: 6f31cabef229131668d49ba3955abfade7e1ca68 SHA-256: c621ef53cbcb2d34aad508d31238e1a02e467c0ab2e01e04ea63d355d7356e94
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO poisoning or redirecting users to malicious sites. One prominent URL, 'https://ttraff.ru/pify?keyword=cleaning+services+contract+word+template', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious content as a legitimate contract template. 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=cleaning+services+contract+word+template In PDF document text
    • http://rawime.sheepprogram.com/uploads/1/3/0/7/130776334/1322385.pdfIn PDF document text
    • http://direbaka.ysk-chb.com/uploads/1/3/1/4/131406676/tamazemowesojimidal.pdfIn PDF document text
    • http://files.giovannisdesigns.com/uploads/1/3/1/3/131380292/dunexebabi.pdfIn PDF document text
    • http://mizirib.grinnellcecbucketcourses.org/uploads/1/3/1/1/131163590/1500684.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/1/0433/2650/5128/files/xowiwatuzewipaxewuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5326/0701/files/bhagavathi_tamil_movie_hd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/zozozanojisedegibuxola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/78729259133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5366/1851/files/zununepebuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8992/8099/files/mexiwapidiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/moulin_rouge_elephant_love_medley.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/71006344742.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/meme_creator_and_templates_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7061/0851/files/17464222830.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 8

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_off0000913e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x913E 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00009b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B38 5452 bytes
SHA-256: 3571692eb0ebd6b933eee611a1f36f3ea3c714ca3577e0f598429a2f9cb5ec4c
font_02_sfnt_off0000adbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBF 10352 bytes
SHA-256: 55b638b1670b0636dcce8cbc7d415f8ccedc6e2041442d8184ef538a027b0020

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