Malicious PDF — malware analysis report

Static analysis result for SHA-256 94983bbc6ab3d39f…

MALICIOUS

PDF

79.4 KB Created: 2020-11-14 00:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1ffa1d0a9af615e6731cec11c1996916 SHA-1: de68e0f1a72ba8164085cc13b37bec9d2e2d28b4 SHA-256: 94983bbc6ab3d39fb6e94242ffc2f38cceeafa8beb7fc7f9cdce176c6a937a64
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm 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 0.9997

Heuristics 5

  • 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=model+sm+t350 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410214/normal_5fa768dbad220.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/c826ad09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f911e1a40248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5f90ea0505c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_5fa43593f0089.pdfIn PDF document text
    • https://mukozuzaze.weebly.com/uploads/1/3/4/2/134265885/wojobapugose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_5f925a13bafce.pdfIn PDF document text
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/cc007b8cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f8d25f013691.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/carrom_board_rules_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/super_mario_unimaker_2.0_download_zip.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 5100 bytes
SHA-256: fa1258a5f195d02e56830374af308c8fe7c6ae0dc5559bb2ee99aa696ea88fa0
font_01_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 9848 bytes
SHA-256: 23a461198b8a7a9e40a0eb84c4c6c7d7675a597ce4b40d5b3725f3535b5394ee
font_02_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 11720 bytes
SHA-256: f28f6cabdc7d9d7cd02986a737fa52e1a3bae47ae4b0cd6d2910cf51ef2afbde

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