Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bf1a8b4914e394…

MALICIOUS

PDF

40.3 KB Created: 2020-08-15 02:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b79e914961e56a1a4fc569e3026e220e SHA-1: 813712589e2070f2e5cdd07e2f8524c0564d101d SHA-256: 73bf1a8b4914e394da5d4737db5ef5850b8f07394d7bfeedf1fb6201b7e5dd2a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'book pdf' and includes the malicious redirector URL. The presence of numerous external PDF links further supports a link farm or phishing attempt.

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=hsk%201%20book%20pdf In PDF document text
    • http://files.kuepferenterprisesroofing.com/uploads/1/3/2/3/132303410/potagutigab.pdfIn PDF document text
    • http://files.mariosmathtutoring.com/uploads/1/3/1/4/131453682/6e79b55e183.pdfIn PDF document text
    • http://files.redmoonbronxsoapsandteas.com/uploads/1/3/0/9/130970022/0c57c5a6ef9afd5.pdfIn PDF document text
    • http://files.ashraeli.com/uploads/1/3/1/4/131406478/4674537.pdfIn PDF document text
    • http://ridativoj.dhsupwardbound.com/uploads/1/3/0/9/130968926/sufakix.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/1/0430/9054/2741/files/payroll_accounting_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/lusoxififarirema.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/lewizenereta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/24735003857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0201/1548/files/vewamamavosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/waweka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3789/1477/files/nirotinuva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6658/9335/files/simplifying_algebraic_expressions_puzzle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4693/4430/files/49107867612.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9516/9950/files/9287882285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/watch_superbad_123movies.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_off00006075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6075 4912 bytes
SHA-256: 0ae730f2a63fc463b9e72033ea2d45fdce2a34b3a82167a9e7b03ddf7de20fcc
font_01_sfnt_off0000713c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x713C 10348 bytes
SHA-256: a8025175136752d3bea7e80838725f779c4bc713681447f74e7b4de87d796b16

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