Malicious PDF — malware analysis report

Static analysis result for SHA-256 3effdbc354bbd36d…

MALICIOUS

PDF

36.8 KB Created: 2020-08-18 17:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3e1ccb5d7b74c778e912f4db5397edab SHA-1: a90e787c621baa8c28e1471b24caeb932a868a11 SHA-256: 3effdbc354bbd36d052ef97ed01adc33fc0a836636ab7561a785cd08b118e207
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text referencing 'Pennywise clown wallpaper' and a URL that aligns with the malicious redirector heuristic. This suggests the document's primary purpose is to trick users into visiting the malicious URL, likely leading to further compromise.

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=pennywise+clown+wallpaper In PDF document text
    • http://files.shiningstarva.com/uploads/1/3/1/4/131454172/1901447.pdfIn PDF document text
    • http://files.ericphotography.net/uploads/1/3/0/8/130814208/kusefunetuf.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/1/0438/3742/3776/files/bujamaluwabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1261/1481/files/learn_english_grammar_through_tamil_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/fenusajitov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/metodos_anticonceptivos_femeninos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/xunepenukoxutupavoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/gudusemasogedogawanonu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6380/3040/files/xozolanerana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5111/3887/files/using_calibre_to_convert_kindle_to.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/reliance_annual_report_2020.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_off00004b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B0B 5124 bytes
SHA-256: fd1431c81c3cab05eaa2e684cfedf5d9c6049fd388888aeea828d689bf65fa1c
font_01_sfnt_off00005c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C99 13300 bytes
SHA-256: a3b3373d744d4a0facd845a3ddcdd626b5d29fe2e81dad43c790ac917a506d26

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