Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91392341db93523…

MALICIOUS

PDF

55.1 KB Created: 2020-09-16 16:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9a585b4bbaf3749c9cdb66c2af5394ad SHA-1: a21d40519e471200a7a366ef97764bbb6006574b SHA-256: b91392341db93523d4c350a287de1cc70c51fc05edf554fac388612cd98ec1ff
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to obscure malicious destinations and improve search engine rankings for malicious content. One of the primary links directs to a known malicious redirector, which likely leads to further malicious content. The document body, though heavily obfuscated, contains text related to 'worksheet answers' and includes the malicious URL, suggesting a lure to trick users into clicking the link.

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.link/wix?keyword=cpctc+worksheet+answers+kuta+software In PDF document text
    • http://regil.heidispiritmedium.com/uploads/1/3/0/7/130739415/173174.pdfIn PDF document text
    • http://jizunaro.laurawritingcoach.com/uploads/1/3/1/3/131381806/temotesoruba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ae5f4f0c-dc59-4df0-ba50-facd1f4c339e.filesusr.com/ugd/3283b0_4991e5a4a6e946d19090865f83126c67.pdf?index=trueIn PDF document text
    • https://d013910e-b479-4e70-8c1c-9c11c4f65daa.filesusr.com/ugd/145364_de1843baaf2447e8b2940461c4df2c1d.pdf?index=trueIn PDF document text
    • https://e1751e7f-a46a-4e9a-8295-ea902bd7e176.filesusr.com/ugd/29c71c_67442ed6582345d4992544c6323759a2.pdf?index=trueIn PDF document text
    • https://427721dd-fb14-4df7-bc91-b7f222aa2186.filesusr.com/ugd/35c6e2_ac7f321c5fc24a0089aaa82726fbfbf2.pdf?index=trueIn PDF document text
    • https://f5a73eef-2334-4481-82cf-febfc91f6ae0.filesusr.com/ugd/277b62_d1f4dbb697f445f59fe2bc405d8b3409.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/vixaniluzovixibagevewubex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4163/5997/files/niwoniruwodufofitetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/dell_sk_8115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4885/2904/files/lawabajozixavov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1510/9797/files/81749179194.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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
font_00_sfnt_off00007c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C53 5132 bytes
SHA-256: 90f2dd1fd611643760a24b9d1a99b6eddfc28c4eb8dff69c37ce87fc0624dbfa
font_01_sfnt_off00008dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD6 13676 bytes
SHA-256: 410d16ff839e76307c769ef6207b9f750d160062d2d8668c75a2d2748c0c0515
font_02_sfnt_off0000b9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FF 16168 bytes
SHA-256: 13596defb2bcc6fc1048af8e1a4b019015f57a35384aba88f9e1637b8f94b635

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