Malicious PDF — malware analysis report

Static analysis result for SHA-256 280ce5a036afe58c…

MALICIOUS

PDF

36.0 KB Created: 2020-08-12 15:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f5ece9e6f444e81fc99ee7e3ca87d1d1 SHA-1: 2e655e04f63a34f0cb029dfbeabef0801b4c47ee SHA-256: 280ce5a036afe58cc21602c1c2d486ffd016c30fc01e9061d401fb9de9c3441c
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 external PDF files hosted on various domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.com/wb?keyword=invertebrate%20zoology%20pdf%20book. The document body also contains this URL, reinforcing the lure to a potentially malicious site disguised as a book download.

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.com/wb?keyword=invertebrate%20zoology%20pdf%20book In PDF document text
    • http://files.worldiqchallenge.com/uploads/1/3/1/4/131438308/02dc5242.pdfIn PDF document text
    • http://vuvajovu.biophilicdesign.net/uploads/1/3/1/3/131398140/migujitaxo.pdfIn PDF document text
    • http://files.fudosanbunka.com/uploads/1/3/1/4/131483719/nulovapipifer.pdfIn PDF document text
    • http://pejajo.estebanfj.com/uploads/1/3/0/7/130776542/169e4.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/1/0432/8544/6824/files/bewezeger.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/agama_islam_kelas_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4520/3618/files/burger_king_gutscheine_juli_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/nefaxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/soccer_referee_score_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/zotedak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/pokitolen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/pogedefewenigigozolepeke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/medicinal_chemistry_of_anticancer_drugs_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5495/4656/files/student_council_president_speech.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_off00004fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC2 5384 bytes
SHA-256: 5836ca20d280a102bd24cf8be021195e3667f26ca7a64d5ba7b255e58267a580
font_01_sfnt_off0000622f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622F 9736 bytes
SHA-256: 85c14a5380e7f2dec8e276120235915de87eb95da1dc9fbfb730e43abdc224ce

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