Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdb53b99ec30ac7…

MALICIOUS

PDF

50.3 KB Created: 2020-10-31 19:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 006c9825afeab6223e7d8588a632b771 SHA-1: dd9b1c6a08349ff673c53f37d40df2aae22891ca SHA-256: bbdb53b99ec30ac736f97adf98db624f56b670ba4c38d8bfaf2b0778cca22a07
172 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=vidmate+free+download+apk+2018 In PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/df415b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f872fd28a3ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f9059bc809b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5f8bcfc5ee93a.pdfIn PDF document text
    • https://gogiwujuduk.weebly.com/uploads/1/3/4/3/134352159/midaluvetevodu.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/35967f688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f93d3d334400.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/27f77d03458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f92a75e0a0e0.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/4041939.pdfIn PDF document text
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/f5ea37592d2da9.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/takejesananaloxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5f97a1a49d6c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa54eae7-4d1c-4be4-bda0-011ea0762cc1/25745242816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d95dd9e9-c0bb-4fd8-8ce6-2b962dec594c/14191995468.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E71 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off000078ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78FF 5648 bytes
SHA-256: 6802c4ca782ca062e1308bbcf93ae3fe5f22c8414ee1a0c111a1f126495779cc
font_02_sfnt_off00008c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C34 1932 bytes
SHA-256: 4aa063a26bd9e70ad0d04acb797bb2078f152c78321be1114478748fdf4fbf58
font_03_sfnt_off00009576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9576 10692 bytes
SHA-256: 3ff3f0adf215961c441ccbbf265fb041dfbff0aaf6c744128aa045abe6251f18

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