Malicious PDF — malware analysis report

Static analysis result for SHA-256 401e2a72dfe9d5f4…

MALICIOUS

PDF

44.2 KB Created: 2020-08-15 15:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 048d0ac652248ac062fff9c7dd8ceb2f SHA-1: cf5334bc1f1942794c388a268a8f55d0263a0f06 SHA-256: 401e2a72dfe9d5f4a9cfc56dfe49a015a59b66daca54a62d091b980901a9c4a2
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a piano tutorial. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms this. The embedded URLs and the ML classifier strongly indicate malicious intent. No scripts were extracted, but the primary attack vector appears to be a malicious redirector link.

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/wb?keyword=relax%20take%20it%20easy%20piano%20pdf In PDF document text
    • http://files.bostons4littlepaws.com/uploads/1/3/2/7/132740614/3838229.pdfIn PDF document text
    • http://files.laurasmithauthor.com/uploads/1/3/0/8/130874284/9521626.pdfIn PDF document text
    • http://files.justdupree.com/uploads/1/3/1/6/131607103/xubivuko.pdfIn PDF document text
    • http://files.hornsbyptsa.org/uploads/1/3/1/3/131379434/bomujakurufilo.pdfIn PDF document text
    • http://files.charliethewritingcoach.com/uploads/1/3/1/4/131437363/91d3f453dcafb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/68841794447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6347/4331/files/lamegase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/arch_kde_install_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5476/8032/files/wexatewanewakos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/170499327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/5000_watts_power_amplifier_circuit_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pijajaza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/zosesevoleratusiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/applied_operation_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5699/5233/files/23796386333.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE8 4968 bytes
SHA-256: 4b243b2418f7003e0c8781b02436677ed95a67c91b46498b26aa3bae5bdd1b38
font_01_sfnt_off000070eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70EB 10760 bytes
SHA-256: e88aa5615b68070cc5fcf2215bc227b11cc997d0bdb83ed22d70b4b4a6a46dd0
font_02_sfnt_off000095a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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