Malicious PDF — malware analysis report

Static analysis result for SHA-256 b786ed3e1dab5af3…

MALICIOUS

PDF

43.9 KB Created: 2020-08-20 02:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f6d9b5156f3727abcadfb2401cfe24d7 SHA-1: 44b6372fce2136d5d4ea5714c82723ebdf7754b6 SHA-256: b786ed3e1dab5af34860ce38d32e8a480140c0a6e4d91dd13f1b2d1b8e6bdb64
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. This indicates a social engineering attempt to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=pulmonary+arteriovenous+malformations+icd+10 In PDF document text
    • http://files.jin-li.org/uploads/1/3/1/4/131453718/24ebfff6.pdfIn PDF document text
    • http://files.farm2forkfestival.com/uploads/1/3/0/8/130874296/siwipek.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/1/0438/4397/7366/files/das_passiv_englisch_bungen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2089/2834/files/daniel_alcides_carrion_biografia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/sugewerij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5393/2966/files/wepamefiwirolux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/bash_script_tutorial_deutsch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/jnu_admission_result.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/99451855617.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9673/3864/files/jumedeziduxegeledaxikijo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7281/3211/files/zeilik_introductory_astronomy_and_astrophysics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/wulodagame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/70296084966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/32961200797.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_off000062bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BF 5524 bytes
SHA-256: a6b693ab1f15693b6f7937145cf37a0fc91653caa7ed802e651a2cd8c0c5e73a
font_01_sfnt_off00007580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7580 14596 bytes
SHA-256: fa7c69154161ba3364f5d1c59dc98f73afdda345e72baf99fc27090ac571f067

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