Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4c4acac1035127…

MALICIOUS

PDF

41.6 KB Created: 2020-08-11 12:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: abd8db5bcc2a62c596ba210abdf24a1e SHA-1: 0721c5bcf562d48ec5347469e48526cc219692f6 SHA-256: 0b4c4acac10351271b7df0046ba13142ccc955a47a69068a4e075600eecac22b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to a redirector service (ttraff.ru) which is flagged as malicious. The document body, though heavily obfuscated, contains the URL that is also present in the malicious redirector. This suggests a phishing or malware distribution attempt using a link farm strategy.

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=las+asignaturas+en+ingles+ejercicios+pdf In PDF document text
    • http://files.ygnaciocenter123.com/uploads/1/3/1/4/131437563/a3eb39086711073.pdfIn PDF document text
    • http://files.ncmilitaryoutreach.com/uploads/1/3/1/6/131637168/2129055.pdfIn PDF document text
    • http://romiz.odenhouse.org/uploads/1/3/0/8/130813866/4513224.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/1/0439/0033/8331/files/nadesorovuguresosunitima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/70961335966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tutokufumetuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/harry_potter_books_bloomsbury.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9100/8419/files/nakoker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/16893071437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4171/7414/files/chiro_9000_natural_form_mattress.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4184/1571/files/19085522196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/54727249179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/ligabidulopemowupodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3972/5470/files/43187814988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/kreenig_snarlsnout_wow_classic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4697/3088/files/humana_dme_prior_authorization_form.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_off0000617c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 5340 bytes
SHA-256: 5ac16f65bab113948fd33dcfd2af290ae9a5b0a8db56ff12148df39282e1781c
font_01_sfnt_off000073ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73BA 11104 bytes
SHA-256: 1e7167d08dad01b6f439dabee10bc51e339ae3d413322ab165047fb3ee3b7bd4

Open this report in the interactive analyzer, or submit your own file for analysis.