Malicious PDF — malware analysis report

Static analysis result for SHA-256 20af3477bb34c325…

MALICIOUS

PDF

39.7 KB Created: 2020-08-11 10:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4cf9d8aa37a6636bbecd2a646e25f297 SHA-1: a053eb7cd0739ce68e217c35d796220b30d72011 SHA-256: 20af3477bb34c3254776593ac510f61dff45f6d3a40f61dbf5f4a9f7249622cb
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains text that appears to be a worksheet title, suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. No scripts were extracted from this sample.

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/wb?keyword=rearrange%20sentences%20worksheet%20for%20grade%201 In PDF document text
    • http://files.whitepeacockcoffee.com/uploads/1/3/1/4/131436971/7dad80.pdfIn PDF document text
    • http://files.jessicawelshpiano.com/uploads/1/3/0/7/130775707/56899.pdfIn PDF document text
    • http://files.combslongapcep.com/uploads/1/3/1/3/131378942/pivivofudimav_povisubomulu_nigikupesixup.pdfIn PDF document text
    • http://files.custercadet.com/uploads/1/3/2/7/132710630/748b56.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/1/0430/7252/0353/files/75377703417.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/criminal_law_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/wewawexisusibuleb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/gezezusisibomibide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0067/5995/files/pedobavisekawuzale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6482/6783/files/49005223840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/51633392691.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2803/8310/files/carburetor_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/91432794101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/rawukanoxir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3709/0211/files/71479007502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/cathtrisme_urtral.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/applications_of_thin_layer_chromatography.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/37854399284.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_off00005daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAF 5464 bytes
SHA-256: 39c66fb53c19cb7dd90e8ea0d0cf27f0c42cc7e8b4356befc35191ca2cd283f5
font_01_sfnt_off00007059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7059 9632 bytes
SHA-256: a4189279b34baa499ab1af9134dfebf7bd397d2ecad5d9a55ac123ad4f564ebf

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