Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8f27d5f933f3d1…

MALICIOUS

PDF

39.3 KB Created: 2020-08-19 10:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 558c340bfa17874d86cb3a5e18e3918c SHA-1: 1dc5341731820e0f3475295189f772741b0ca3f2 SHA-256: ac8f27d5f933f3d1c0e906981e20ab93136032a50d1ede9b8b59be143f578f6c
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'free addition worksheets'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or malware. The presence of a link farm and a redirector suggests an attempt to distribute malware or conduct phishing.

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=free+addition+worksheets+without+regrouping In PDF document text
    • http://files.pro-consolutions.com/uploads/1/3/1/3/131379553/85512d55500435.pdfIn PDF document text
    • http://files.sagehousebathnbody.com/uploads/1/3/0/9/130969357/kubetizezobere-dizir-mapikisugore-tokenexo.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/1/0436/0588/5090/files/zexomoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/87270591613.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/13995804015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/34166640904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/unbreaking_minecraft_enchantment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8384/8093/files/google_weather_report_please.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/18263859039.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9676/8665/files/dabamujozapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/pobefejipimusaxiwedagob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5020/4327/files/ssc_chsl_answer_key_2018_march_8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/vedivavijefovoluboxudita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ganisififado.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 7

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_off00005c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C14 5300 bytes
SHA-256: 633192d6a8a7423e573f94f528a385b1b7995e27de22938d8ccfbeea98c61a60
font_01_sfnt_off00006e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2C 9976 bytes
SHA-256: 591c563cf856bc37c02f8a4ded65ef66c05410dc249049192c14a45ac8ff16fb

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