Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3c159dcf74896c…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 14:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fc7029af10a5c65619aba5ed42eaee31 SHA-1: 1cf628bf70d5b914da4e74830ff9a883d25ab916 SHA-256: 4f3c159dcf74896c41d1e219f320ed5142f8c837d638cd5a37ef96beaca98275
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body text, though partially corrupted, includes the phrase 'Big bang theory essay pdf' and the malicious URL, indicating a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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=big+bang+theory+essay+pdf In PDF document text
    • http://kizilusuj.northstarmusicak.com/uploads/1/3/0/8/130874422/615112.pdfIn PDF document text
    • http://files.canyons-ea.org/uploads/1/3/0/7/130775952/gituwuwefi-bogav-kulig.pdfIn PDF document text
    • http://files.leadersaliveintl.com/uploads/1/3/1/3/131380786/1091201.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/1/0432/5743/0176/files/83005554741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6873/6166/files/16753768111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/example_shading_answer_sheet_for_let.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1573/9304/files/29789550520.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/26490672881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2251/5351/files/cambridge_latin_course_book_1_fourth_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/davumitifere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/4685/8915/files/36500476091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/wuxakob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/3467/6133/files/design_thinking_process_and_methods_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6498/2693/files/17022962708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/veludagidigube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9272/8226/files/56325496157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/10248532555.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 3

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_off0000675f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675F 5564 bytes
SHA-256: aca7e4b793166a537a2f1097eebac827fd414e189cee5ff8c531c2ea565f75ca
font_01_sfnt_off00007a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A40 10128 bytes
SHA-256: fc32c413ba1e9bf87ba7250b6eeacca000ddcf9de81494843c1612e2f681a7a7

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