Malicious PDF — malware analysis report

Static analysis result for SHA-256 644c733ff4df0a9d…

MALICIOUS

PDF

44.3 KB Created: 2020-08-01 06:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f33aff1c3eb837e40e693ed11ae3f9fb SHA-1: e03e4472adefd45631dc413ddfd743a6266cb6cf SHA-256: 644c733ff4df0a9dd400fa94355cc093ff7c2e1c2f4e43ebf36847a833457de5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to trick the user into clicking it. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=snap+i%2527+ve+got+the+power In PDF document text
    • http://files.bishopgradykofc.org/uploads/1/3/0/7/130775062/foxolal.pdfIn PDF document text
    • http://files.endofbelief.org/uploads/1/3/0/9/130969003/vatusezipusofif_nonivoxujida.pdfIn PDF document text
    • http://files.mcmjanitorial.com/uploads/1/3/1/4/131406356/5b2cce2e6e7ba.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/1/0427/8406/3654/files/30759368807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/17252346324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0981/7251/files/caracteres_ascii.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/fimewunakim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/vegitagibiguguvafok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/99561288272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56751463133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/94798253504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/penutip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4327/3369/files/98370227869.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4379/9719/files/multiplication_in_java.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/75263091360.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_off00006e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3D 5160 bytes
SHA-256: 4b3a3eec71a6a0c6555787cbc2a1efe91562b3e387329438fbd14fb0b7eb115c
font_01_sfnt_off00007fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE6 11132 bytes
SHA-256: 3d537192d08e6b794fddc65bf07849bc4c4992217f9ff31aa7e1fb88db668baa

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