Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac2239fb5dff511…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 18:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: efbefee2ce3899e7d83aa9bff628656b SHA-1: 3a47fdfa24273e8b4248035592699ec681c49397 SHA-256: 8ac2239fb5dff511c15b9b2895445a2ea1df1d8ee6452f98c77cd6eccf5310e6
142 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain the URL and a lure related to educational worksheets. The presence of a 'download button' heuristic further suggests a social engineering attempt to entice users to click the malicious link. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=acids+bases+and+salts+class+7+worksheets In PDF document text
    • http://files.jwandersonjr.com/uploads/1/3/1/1/131164546/zonakajatot.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/1/0437/1070/9913/files/75026904932.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/detoxezimifibawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/naresadakinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/fundamentals_of_molecular_virology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/biomass_based_power_generation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/destin_surf_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9776/8614/files/87662374281.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 2

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_off00006c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C48 5392 bytes
SHA-256: f8c9d5e34888f8033cca59382868bdfb4f052c57694f212b3cc869f4345b073c
font_01_sfnt_off00007ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 10100 bytes
SHA-256: 7619e5a854327c709c89ed9346cf4c5049fe8d450011c5f7a627334eaa5e9416

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