Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ab3e8624beb35e…

MALICIOUS

PDF

41.4 KB Created: 2020-08-10 01:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 497b2639bdacd219af3860163dba0cb7 SHA-1: 4675d0fdd619cfe0a1a5239b27dfa2cb146e16c8 SHA-256: 91ab3e8624beb35ecc13ebe69842e5484561b28f897ebd8c67cd50cd5c7de47c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link and a link farm. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests the document's primary purpose is to trick the user into visiting the malicious URL.

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=certified+kubernetes+administrator+study+guide+pdf In PDF document text
    • http://files.galitfriedlander.com/uploads/1/3/0/7/130739621/8887277.pdfIn PDF document text
    • http://files.shelbywielgus.com/uploads/1/3/1/4/131438245/1569241.pdfIn PDF document text
    • http://files.chicagostatechamber.org/uploads/1/3/0/8/130814716/83911f.pdfIn PDF document text
    • http://files.drivenbypleasure.com/uploads/1/3/0/7/130740323/cade6d1ed1b4fc.pdfIn PDF document text
    • http://files.olivareslock.com/uploads/1/3/1/4/131438202/bd703f3aa.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/1/0436/5680/6553/files/71629405229.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/39817878024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/10759953665.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0453/5307/4843/files/grade_9_math_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0415/8364/files/adobe_lightroom_6_torrent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/gungeon_gun_soul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3257/5132/files/xegidusuzesomoxep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/advanced_analytics_with_spark_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9613/6097/files/89144967383.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_off00006293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6293 5540 bytes
SHA-256: f231f0ac8ee2b1c15cc523415a63625262c4c8b1323e74d7fc4217cbbc519728
font_01_sfnt_off0000755d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x755D 10216 bytes
SHA-256: 9334fee5a2d77e1a8b3ebb0e18db0e7ef696ab7613a268282d5481592625cd43

Open this report in the interactive analyzer, or submit your own file for analysis.