Malicious PDF — malware analysis report

Static analysis result for SHA-256 40442e81a87d04d7…

MALICIOUS

PDF

33.1 KB Created: 2020-08-01 08:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b7d3e3d350c3bafeecb1a33cd17eb4b8 SHA-1: d5e87a480380e04b89c19b036deeab0d88dc9baf SHA-256: 40442e81a87d04d7e857035a5f32dde7b3a42dac7594f011aef43e5b4fb16d55
194 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, designed to redirect users to potentially malicious content. One such link, 'https://ttraff.ru/pify?keyword=sonic+advance+sprites', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting a lure to external 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=sonic+advance+sprites In PDF document text
    • http://files.mindfuldoodles.com/uploads/1/3/1/6/131637881/6618631.pdfIn PDF document text
    • http://files.torringtondems.com/uploads/1/3/1/3/131384468/745649ee37.pdfIn PDF document text
    • http://files.shadysideofthetracks.com/uploads/1/3/1/4/131406762/9744250.pdfIn PDF document text
    • http://files.info-integratedtherapysolutions.net/uploads/1/3/2/3/132303286/8492154.pdfIn PDF document text
    • http://files.zion-top.org/uploads/1/3/0/8/130813934/geriz.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/1/0429/5039/4019/files/84623653465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/sasomimenevabudolunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2126/3271/files/62319756532.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52657742202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/dulunuzolaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6914/5241/files/30475759115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4789/2630/files/58997722702.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevegijetowid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/zetagakutulonuzit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/16922651642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/fowunozumolenamotezew.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_off0000458a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x458A 5196 bytes
SHA-256: af9a99e7eb1302cbae517a4f96a793bc2b4f5733cd2a9ee35fab0ddd1fc7bd96
font_01_sfnt_off0000574d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x574D 9432 bytes
SHA-256: 00f488a741d7038110727b1eb9b6b5c7db4a310c0f0d3e480d406f30fb63b524

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