Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ce28ce77ed4fc0…

MALICIOUS

PDF

33.9 KB Created: 2020-08-14 20:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3ca1cd247db3579035c8efa23ba0527a SHA-1: 0075e1da860d66056df6045612c5ec7e8a6ba33b SHA-256: 20ce28ce77ed4fc06df0e13400a5b243f0631c14b1a2f58bef5344f8d7d994c3
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=singular+possessive+nouns+worksheet+pdf'. The document body, though partially corrupted, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware delivery. The presence of a link farm further supports the malicious intent of directing users to potentially harmful sites.

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=singular+possessive+nouns+worksheet+pdf In PDF document text
    • http://files.owenstaxlouisville.com/uploads/1/3/1/4/131453633/fupexanigikun-nolasoboj-gadigenerawuz.pdfIn PDF document text
    • http://files.freshrescue.com/uploads/1/3/1/3/131398357/2325814.pdfIn PDF document text
    • http://files.horsetrekmongolia.com/uploads/1/3/1/4/131409170/lumara.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/1/0439/2235/8427/files/74744960726.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/pokemon_prism_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/somor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9273/0275/files/psychological_disorders.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/gunabizet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7781/9802/files/connectors_in_english_with_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9815/2866/files/nujujedipokule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/56171164267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8204/6869/files/26803869578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/dufamilij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/22902180941.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_off00004633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4633 5624 bytes
SHA-256: 6c84b81076e7cf86438770e08f547c20ccaf96666b74b2e5037c7a80593129b0
font_01_sfnt_off0000595c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x595C 9736 bytes
SHA-256: 8c919add8919b1135ddff2083a3dd092510b1846709c033a3eae3a2f3b280369

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