Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea332fad5ba4b770…

MALICIOUS

PDF

46.4 KB Created: 2020-11-01 14:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c77bf5295d7881fd81b0a17624b84827 SHA-1: 73fcd804e67a98c400bf79d983155bd65d8df0dd SHA-256: ea332fad5ba4b770f7fb7e433d0eed7bd3e438b03e8c41f0d8c657216cdfbc38
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a lure for downloading a Chrome installer, which is a common social-engineering tactic to trick users into installing malicious software. It also hosts a large number of external PDF links, suggesting it is part of a link farm designed to improve search engine rankings for malicious sites. The primary malicious URL identified is ttraff.ru, which is flagged as a known redirector.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.ru/123?keyword=free+download+chrome+offline+installer+64+bit
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/2907083.pdf
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/vexusuras.pdf
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/4cada.pdf
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/pajewuzad.pdf
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/ebec36e86.pdf
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/1776312.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0484/3097/3080/files/tinexutita.pdf
    • https://cdn.shopify.com/s/files/1/0498/4907/3830/files/eoct_physical_science_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0499/9086/0962/files/63713277343.pdf
    • https://uploads.strikinglycdn.com/files/8debf1fb-5dc9-430d-8cdf-130b61ad2c31/vutarodejun.pdf
    • https://cdn.shopify.com/s/files/1/0481/3167/0179/files/kaxudorunekuzuzakeriwo.pdf
    • https://cdn.shopify.com/s/files/1/0504/4217/4618/files/geometry_dash_full_apk_2020_ios.pdf
    • https://uploads.strikinglycdn.com/files/a891d6b7-503b-4941-bcaf-377285ea95b4/breath_of_the_wild_recipes.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_off0000741f.bin
fa816f520aec87749e6c4422e90633d08603d24fe172ac265f4b4d95e2a30115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741F 5688 bytes
font_01_sfnt_off00008767.bin
61ebc397efd752659daa05e90370830d0ec51b48589dc67f928d4015972f9f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8767 10792 bytes

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