Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b109a31717fa2e…

MALICIOUS

PDF

51.0 KB Created: 2020-08-17 12:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 55a445c3d2ed395c35489e4542390517 SHA-1: 0f4c2852d3efe9877634d3fc8e8aeeb1899ed8ea SHA-256: 21b109a31717fa2e7b42f1819961f3d443fdc342fdce7f58fd3cfc63ecb94b2f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with 30 external PDF links detected. One of the primary links, 'https://ttraff.ru/pify?keyword=letter+format+for+promotion+application', is flagged as a malicious redirector. The document body appears to be malformed or contains obfuscated text, but the presence of numerous links, including a malicious redirector, strongly suggests a malicious intent, likely related to SEO manipulation or directing users to malicious content.

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=letter+format+for+promotion+application In PDF document text
    • http://files.laurenbretana.com/uploads/1/3/2/7/132712000/ranidunarifafisev.pdfIn PDF document text
    • http://gizajirip.adnpkids-researchfoundation.org/uploads/1/3/0/7/130739777/ludedo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/iwaszkiewicz_brzezina_chomikuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9779/2415/files/86958763375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/21094780660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8769/9876/files/gepusumusepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/aurlien_barrau_livre.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1679/7857/files/ashrae_90._1_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/journal_ennahar_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8121/0787/files/88258800245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/75826223630.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/jexixewekuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/fuxapulafekab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/algebra_2_quadratics_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/kesivetizagaxa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3B 4712 bytes
SHA-256: de81d4914cdb6eade6b9d3e9c84dbcb9fa14b9b4fead9b1cbd2b5591091f0de1
font_01_sfnt_off00008c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C16 10720 bytes
SHA-256: 90eef006a48cb580d4587d2ba194d64e7634e17ae1be4a171f37413d83f7a7c8
font_02_sfnt_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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