Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8e4693173b9540…

MALICIOUS

PDF

33.9 KB Created: 2020-07-10 11:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d154cf5a44ffb6bac0d67a40589dfc47 SHA-1: d5eb6ecf3bc11576dda58abaa00d8179dcebbde2 SHA-256: 6d8e4693173b95404d0eea1a2e5a584ac68aa643d6d8ba3992d279c729fdd707
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous links to external websites. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, and another identifies it as a link farm. The document body contains a mix of obfuscated text and URLs, suggesting an attempt to manipulate search engines or direct users to potentially harmful content.

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.
  • ClamAV: Pdf.Dropper.Agent-9526240-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9526240-0
  • 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.cc/wb?keyword=applied%20numerical%20methods%20in%20c%20pdf
    • http://files.marzipan-media.com/uploads/1/3/1/8/131856184/7584706.pdf
    • http://files.walkwithgantz.com/uploads/1/3/1/4/131406108/liradenesuxaj-vuxugori.pdf
    • http://files.jimstamperjewelry.com/uploads/1/3/2/3/132303092/guravapajimofaz_xexam_tezuwagok_bavig.pdf
    • http://files.healthyforest.ca/uploads/1/3/1/4/131453248/rokoliz.pdf
    • http://files.ayanakyounglawllc.com/uploads/1/3/2/6/132681398/42eaadf4.pdf
    • http://files.jovaunholmes.com/uploads/1/3/0/8/130873973/818c81.pdf
    • http://files.judymtomlinsonphotography.ca/uploads/1/3/1/8/131872138/midumafeganabagosutu.pdf
    • http://files.alexstudio.bg/uploads/1/3/1/1/131164448/875fbb5e4c12d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vomobudutud.files.wordpress.com/2020/06/63316366149.pdf
    • https://zexosutu.files.wordpress.com/2020/06/32832940718.pdf
    • https://kovimaj.files.wordpress.com/2020/06/xofoluzawubo.pdf
    • https://baboraxotav.files.wordpress.com/2020/06/wutabolikinaxa.pdf
    • https://venazuburam.files.wordpress.com/2020/06/86781311672.pdf
    • https://vupejesos.files.wordpress.com/2020/07/winanubaran.pdf
    • https://gadaxug.files.wordpress.com/2020/06/zeruxanexebuvewug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kitona.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048c5.bin
5219807406821d4aac628b06111102b56d55737bd19eaa139cf8c69715970384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C5 5264 bytes
font_01_sfnt_off00005a65.bin
352e0408b89a9c61f691d4766aef0540f0cd31cef8b1b153d7ee664d9d44e7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A65 9608 bytes

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