Malicious PDF — malware analysis report

Static analysis result for SHA-256 491fff5ada72b387…

MALICIOUS

PDF

39.8 KB Created: 2020-08-10 07:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dfb4a5000b2e96508e74a35f3c27bfdf SHA-1: 6269c14f5da187a586664f85af75a9c29540f624 SHA-256: 491fff5ada72b38788b84998dd68657e13fe1382c8fc2f9f115764d10f4d822e
234 Risk Score

Malware Insights

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

The PDF file contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though corrupted, contains text suggesting a lure related to sheet music, which is then linked to a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=one+republic+apologize+sheet+music+pdf In PDF document text
    • http://files.antiquestauranga.co.nz/uploads/1/3/1/3/131380612/riboro.pdfIn PDF document text
    • http://nopetexo.purplelotusspiritualhealinginc.com/uploads/1/3/1/0/131070450/besopakasabodi-kuneginipifo.pdfIn PDF document text
    • http://files.yecsonline.org/uploads/1/3/1/0/131069812/dofirulazu_lejegi.pdfIn PDF document text
    • http://files.ginahochstall.org/uploads/1/3/0/8/130874162/jodeganinisetoden.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/1/0437/3777/6289/files/certified_ophthalmic_technician_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7789/4293/files/21347351204.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/83248743636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/cold_supply_chain_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/cinematographer_magazine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/64012141591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8209/4494/files/sakanikevoreke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0703/9895/files/autocad_3d_plugin_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/jopoberolobiputugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/killeen_craigslist_org.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_off00004f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F86 5784 bytes
SHA-256: fde934266626f8655fe521000de3b4cb3d4327642959f2fef82c23da1c838ecb
font_01_sfnt_off00006306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6306 15308 bytes
SHA-256: f8a39d4c7ffc341fb8c02947ad6aaecdbfd1ff47741a97e3b8a426fff32f3a9c

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