Malicious PDF — malware analysis report

Static analysis result for SHA-256 a965b4be7745bc2b…

MALICIOUS

PDF

66.5 KB Created: 2020-07-27 07:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5b385a8f902881c0823bd69354c25f6e SHA-1: 967bc728077fd3bb909d418adf65aedff2c15bd6 SHA-256: a965b4be7745bc2bee6902ee10a1bde9e137fde79ef6098f61d57f829acae77b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK directly indicates the presence of a malicious URL, and PDF_SEO_LINK_FARM shows a large number of external links, many hosted on Shopify. The primary malicious IOC is the redirector 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.ru/pify?keyword=answer+key+2019 In PDF document text
    • http://files.professorwillis.com/uploads/1/3/0/9/130969819/3536095.pdfIn PDF document text
    • http://files.belleandbeaucompany.com/uploads/1/3/1/4/131438541/2048877.pdfIn PDF document text
    • http://files.cborbaphoto.com/uploads/1/3/0/7/130775561/1234226.pdfIn PDF document text
    • http://files.nationalhellenicsociety.net/uploads/1/3/1/3/131398259/1450b08.pdfIn PDF document text
    • http://files.wardwatkinsinsurance.com/uploads/1/3/1/4/131437484/3ca04.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/1/0430/7173/3917/files/92611968966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/gozinemukurobiwiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/71158905644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1901/6104/files/nosidajodilupulukoku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/86281559892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/tozazurigakipoxek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2775/9257/files/wulaboxem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/53673730255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/8505799719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8407/8503/files/52277269577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/89634506612.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6012/4061/files/6788102344.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b119.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB119 8936 bytes
SHA-256: 572d7d9463a033d138de203e6633c31374e426a28428e5f5a256e20741a72a6e
font_00_sfnt_off0000a10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA10C 4716 bytes
SHA-256: 275d2935b41f30c1001e7c9f13cf4a6a63125f46a227aab04e50302e3f794e9f
font_02_sfnt_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 16344 bytes
SHA-256: 42323f96fd6dfc37ab08af436043e016a9a0bc9c911e0187067a33a2aae36195

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