Malicious PDF — malware analysis report

Static analysis result for SHA-256 669094328c65782b…

MALICIOUS

PDF

41.0 KB Created: 2020-08-21 02:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4c53b206edc2170732bd234c32b4912c SHA-1: b32019a468befa5aa0941117257c7f25b15d459d SHA-256: 669094328c65782bd914d01adcb533fe65d77045b0baf294477baadc3265bf44
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that lead to a redirector service, which is a common tactic for phishing and malware distribution. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for an answer key, suggesting a phishing attempt. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=mpsc+final+answer+key+rajyaseva+2019 In PDF document text
    • http://files.centrepointecincinnati.com/uploads/1/3/1/4/131406413/e08b8.pdfIn PDF document text
    • http://rixixepa.bpesfoundation.org/uploads/1/3/2/3/132302963/2243693.pdfIn PDF document text
    • http://files.graceub.com/uploads/1/3/2/6/132681404/6733747.pdfIn PDF document text
    • http://giwuvive.redclayphotography.org/uploads/1/3/1/3/131379326/dururemedoreva_tiduwun_tonefizoluki.pdfIn PDF document text
    • http://files.toromewithdino.com/uploads/1/3/2/6/132695862/letusawurigamas.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/1/0438/5928/0022/files/thomas_calculus_2_trke_zmleri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0742/6216/files/69951274837.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/retowepafugukajarewofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/atkins_and_depaula_physical_chemistry_9th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/62087726066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/canada_immigration_form_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3672/0808/files/bupaxepikuramesabop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/12470119395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1687/0298/files/formulaire_attestation_de_travail.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/91130553265.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_off00006043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6043 5892 bytes
SHA-256: e80d87fd697e0d0b82c49205253ab1088b3c9090f86398f927e05edabcacd645
font_01_sfnt_off00007487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7487 10012 bytes
SHA-256: e3e6fe90026372e9eb90644ed229273eb48a42242b946132b11342cd46640d2d

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