Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b51c440ca624263…

MALICIOUS

PDF

69.5 KB Created: 2020-08-09 08:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 97a9a374b69de67388dda71dbf76fc47 SHA-1: 64aa6d0f38940dd972df6fb1865ea2ac55c5b904 SHA-256: 4b51c440ca62426314ea27dcc3bc90fe6752268b29b05e5fc84f570d045de746
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, many of which point to a link farm hosted on Shopify, designed to appear as legitimate downloads. The primary malicious link, 'https://ttraff.cc/pify?keyword=freebsd+handbook+pdf+download', redirects to known malicious infrastructure. This suggests a social engineering attack aiming to trick users into downloading further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=freebsd+handbook+pdf+download In PDF document text
    • http://wetuj.meigspto.com/uploads/1/3/2/8/132815367/tofaso.pdfIn PDF document text
    • http://rudetiz.pgtbbytrinaweems.com/uploads/1/3/1/6/131637136/1399628.pdfIn PDF document text
    • http://files.charlottemounteventing.com/uploads/1/3/1/4/131405948/silutitijumirobuw.pdfIn PDF document text
    • http://files.theavocadocupboard.com/uploads/1/3/1/8/131856039/sepolam.pdfIn PDF document text
    • http://files.laudablemudstudio.com/uploads/1/3/1/3/131398432/lobufazepubu.pdfIn PDF document text
    • http://:file-www.openbsd.org/spamd/traplist.gzwhereIn 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/1/0435/2350/6336/files/79711356444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/adding_and_subtracting_rational_expressions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/bowasojikigaxevaxuzoka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/git_set_tracking_branch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7424/7069/files/70310562057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0453/2230/5691/files/20201875052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7640/9751/files/95329274319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7688/6431/files/rixuwamu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4135/7977/files/vasibekivatar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/pemalozubani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/osha_illumination_standards.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/35164462313.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_off0000c630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC630 5380 bytes
SHA-256: b7d5260c9145d9a3dc49dabee83199f5627edab21b955d385c05b8d66e70c82c
font_01_sfnt_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 14716 bytes
SHA-256: 64336d6bc819df4c41b7616ca59a821541e766bf02491e11c9f80f0bf16787a4

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