Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4b9e6c1828f323…

MALICIOUS

PDF

49.2 KB Created: 2020-09-27 13:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dbe8601818b4fd69983dee1dff59d046 SHA-1: f8553d26a1e424623585f322327ea905d42efdb0 SHA-256: 7c4b9e6c1828f3237a75918ca3fbc693ed66bc2b5b5773e6ebacbeae1f4ebd0a
184 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many pointing to disposable domains and redirector infrastructure. The document body contains a URL that appears to be part of a link farm or SEO manipulation scheme, likely intended to drive traffic or distribute further malicious content. No scripts were extracted, but the overall structure suggests a malicious link distribution or redirection attempt.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=earth+with+iron+oxide+water+treatment In PDF document text
    • http://files.smokestopvapes.com/uploads/1/3/2/7/132710621/506146.pdfIn PDF document text
    • http://tomodewak.sledgedistillery.com/uploads/1/3/2/6/132695213/kewisi.pdfIn PDF document text
    • http://vetax.clarklavery.com/uploads/1/3/1/8/131856077/dubigezanuwej_vewojox_mawonubumofi.pdfIn PDF document text
    • http://files.westcoastsailingclub.ca/uploads/1/3/1/6/131637853/33ef32b.pdfIn PDF document text
    • http://files.alcchealth.com/uploads/1/3/2/8/132815094/f5e483.pdfIn PDF document text
    • http://sibajija.tiafinnauthor.com/uploads/1/3/0/9/130969742/mamusurigis-sogegunufegil.pdfIn PDF document text
    • http://jizixodov.mariambaker.org/uploads/1/3/1/8/131871674/povodajasetulasar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/best_android_tv_box_2019_malaysia.pdfIn PDF document text
    • https://62c472d5-50b4-4fc4-8d10-5caa38a388b3.filesusr.com/ugd/943725_86d6d8cb44834e6d86adddcee0decb2a.pdf?index=trueIn PDF document text
    • https://6c36255e-896a-4394-8443-da524a598a1b.filesusr.com/ugd/b7306e_790db478af7244b58e101a07102707cf.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000766e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766E 4760 bytes
SHA-256: 85fc39e99701d34bee5a2da6773743d716527266307d080bf49fb9c7e3ef37fe
font_01_sfnt_off00008675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8675 10420 bytes
SHA-256: f7ba1b0aa97336c52332c8be73b8f4bee5dda60bf11bdf66e7168e6ca6e3b1f8
font_02_sfnt_off0000aa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA1C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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