Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2819db8bd463720…

MALICIOUS

PDF

51.0 KB Created: 2020-08-01 10:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a40a83c32faa56f6e411764ca75236b4 SHA-1: a9d0c014e6b6e445149be63ed08347a108173b60 SHA-256: a2819db8bd4637206a8495f4b8c1c2be1eb54a98e928576449e045fe5a74d14b
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used in link farms for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to a known malicious redirector, traff.ru, which likely serves as a gateway to further malicious sites. The document body, though heavily obfuscated, contains the same URL and other PDF links, reinforcing the attack pattern.

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=what+is+the+latent+learning+theory In PDF document text
    • http://files.skylarkpubl.com/uploads/1/3/1/8/131871907/lewofikiwi_pefivoro_pawifebimijomet.pdfIn PDF document text
    • http://files.alexandrajosutton.com/uploads/1/3/2/6/132681164/6211900.pdfIn PDF document text
    • http://files.trinitydentalcentre.ca/uploads/1/3/0/7/130775063/nurib.pdfIn PDF document text
    • http://files.krisjezakart.com/uploads/1/3/0/7/130775916/5409252.pdfIn PDF document text
    • http://files.foothealthpractice.com/uploads/1/3/1/0/131070820/4597796.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/1/0431/1344/7581/files/fikolixedesexobav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/86079187398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1624/9767/files/27262049480.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5193/3078/files/6038339372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/34328551126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/69975246198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1330/6530/files/dudesoxiliwixovun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2638/0960/files/masofun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/nowimodaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/1081305616.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000896e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x896E 5060 bytes
SHA-256: 9624672a17397575ed07b97047b5369465d9d3fdd2868d45075f70371594e14d
font_01_sfnt_off00009ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB2 10784 bytes
SHA-256: b58f57c3bebead70ed6959a13d7aeb1d32330e617f9f84e3af6481c14a3134a8

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