Malicious PDF — malware analysis report

Static analysis result for SHA-256 3157d6915e875a98…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 03:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e601255afc9548c01d91781d83f509c9 SHA-1: 50af586cffab8c246ae737b02a75cf39604101cf SHA-256: 3157d6915e875a988f21713a22ae8e4dbdf2619b1b04c6e0b32a2b270a167479
234 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Wondershare pdf password remover' and the malicious URL, suggesting a lure. The presence of a 'Password-protected archive handoff' heuristic indicates the likely intent is to trick the user into downloading a password-protected archive, which would then require the user to interact with the malicious link to obtain the password, ultimately leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wb?keyword=wondershare%20pdf%20password%20remover%20full%20key In PDF document text
    • http://files.ckmoreno.com/uploads/1/3/2/8/132815183/losogane.pdfIn PDF document text
    • http://files.gabrielmalancioiu.org/uploads/1/3/2/6/132695915/792090.pdfIn PDF document text
    • http://files.javasisters.com/uploads/1/3/0/7/130739616/8740425.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/1/0428/5772/6118/files/13247258749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/muxabudotopopimaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/muverolobozupepunibunedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/vewugajepokogab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0221/5074/files/mabemenonusoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4462/3768/files/kakaxupoxako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/mavotaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/mugajalafusijew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/mimuwijeximajek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/nepexasewuwubuwo.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_off00005d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D69 5612 bytes
SHA-256: 644ff5613662ecbcc52888399ae59f46f8f3a3ce75cd10f584e12fa57710c726
font_01_sfnt_off00007074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7074 11208 bytes
SHA-256: f33601021d75ff30822dfb17c372e4c8446e92bc5e0592233bcd5fe3d87a96d0

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