Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81d5d3f2289b7e9…

MALICIOUS

PDF

99.8 KB Created: 2020-08-20 04:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 72b5d596336e13fa0991bd3ebde6c2e4 SHA-1: 58928979509824de565ff688976765ca35122ea6 SHA-256: b81d5d3f2289b7e9d85d0c60e61955b4bbc1d351a9962eea26e84c95660478f9
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the string "Fed up movie notes answers" and the malicious URL, suggesting a phishing or scam lure. The presence of multiple embedded PDFs hosted on various domains indicates a broad distribution effort. No scripts were extracted from this sample.

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=fed+up+movie+notes+answers In PDF document text
    • http://files.penkhullfestival.com/uploads/1/3/0/8/130874316/nunetadawifal.pdfIn PDF document text
    • http://files.casalatinosunidos.org/uploads/1/3/0/7/130776828/1373646.pdfIn PDF document text
    • http://files.tsuaadetroit.org/uploads/1/3/0/7/130739835/7092113.pdfIn PDF document text
    • http://pufare.wall-in.com/uploads/1/3/2/6/132696067/guwidotajagipigadi.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/1/0430/3765/5191/files/hunter_quest_guide_wow_classic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/8423/9268/files/acres_of_diamond_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/cd4011bcn_datasheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3254/2369/files/39127168452.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8051/4726/files/71430622773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/picard_facepalm_ascii.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7028/3166/files/daigremontiana_kalanchoe_aranto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/38953588723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/93883019983.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/brushless_dc_motor_principle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6631/0299/files/fundamentals_of_astrodynamics_and_applications_4th.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_off00014b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2C 5180 bytes
SHA-256: 5d87c06ff90e22360d3fa20d7a28f506acceeacad677c2535fe7bd025a489f24
font_01_sfnt_off00015cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCA 10812 bytes
SHA-256: 15fb61db286d14eee43d4c3ea54be79a32ccd1766619d1bcdb69685a6550391c

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