Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b1f458e5a1b0fb…

MALICIOUS

PDF

42.0 KB Created: 2020-11-05 16:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4d2590da74affc8a6b75480ca742cb73 SHA-1: 2f9699b0fd8f5b40969946d3866e8792b3108d2b SHA-256: 19b1f458e5a1b0fbd45f7a5ef92fccb5e78694b5ae962e1aea2f8f57ab57f5e6
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 1.0000

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://trafffi.ru/strik?keyword=portal+knights+apk+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f95ec94d266a.pdfIn PDF document text
    • https://podesasi.weebly.com/uploads/1/3/1/4/131437149/xupuropupibutu.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5f89c4dea13da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5f990a41a8963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_5f8af14ad5712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f89428a93f68.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/d3e23390-2ba3-44a5-a2fb-e0ec660bfde6/50060912792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b70eeb9-f759-45c4-8cff-6348e90dfeb0/linowipimafevem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050c280f-d348-4852-baf2-e14c0427c8d3/wuzixafexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d2e6a1-a6e1-472a-b62d-a9b8b5cf04e4/65708884928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/444aa3c8-7c09-4178-b61b-40b40189598e/jexuluxitusizitaxumumesog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d0daba-c4d3-456b-b7c8-5453712c6a80/amcor_air_conditioner_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa556b6-9ecf-45c0-8598-9dd3cf1fe9f2/suxukilirug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e89545-d605-4223-a52f-49a7560e6bd4/60827767149.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F0 5440 bytes
SHA-256: 98aa884f57c787a0725f4884caf298e5a55c95e1ae82a52702550be952267a54
font_01_sfnt_off00007640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7640 10952 bytes
SHA-256: 01c28e98dde07b4da0c1b25cf78f455e3657f2e1f3fad569bf7b7f864918a042

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