Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4fb3d285cb3375…

MALICIOUS

PDF

59.4 KB Created: 2020-08-06 14:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d5eda3418ad27b4de8db832addccc96b SHA-1: 60e50856bc63ddf1fbb7f9254973f4b7105f2a76 SHA-256: 5c4fb3d285cb337574e6ef8d8c39c9c5a7ce2d58c29bff8b568b212bec50351e
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector URL that is flagged as malicious. The document body and heuristics indicate a lure for free downloads, likely leading to phishing or malware. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=nebosh%20igc%203%20book%20pdf In PDF document text
    • http://files.lockdescape.com/uploads/1/3/0/8/130874237/c3b6b6.pdfIn PDF document text
    • http://files.mrmamaslv.com/uploads/1/3/0/8/130814169/9161622.pdfIn PDF document text
    • http://vuzibi.teatimewithnaomi.org/uploads/1/3/0/7/130738720/rujijow_vepekuzawuk_sizig.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/1/0431/6423/7992/files/vovarexezoduzemuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/round_in_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/caratheodory_theorem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0869/5192/files/5246028978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/agility_guide_rs3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/tifajisobaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/47181628393.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/74234546939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/lajonutigefugo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/47359864009.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5053/1990/files/41642100202.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 4

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_off0000aa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA08 5416 bytes
SHA-256: 7c54084a5613d3626cd7417dcaf19b3f5b700049948fa5dfe3b3634fa3b70efa
font_01_sfnt_off0000bc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC83 11028 bytes
SHA-256: 9735392e16684443ba75290d4617cb2ba7c03f34e0db6f5d29dc272f37e50d72

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