Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebdf4071ddeeb53…

MALICIOUS

PDF

98.6 KB Created: 2020-11-04 17:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cb61feb1f7b8e16b109acce9d8c541c7 SHA-1: d6ffd1e936eed6dbf532e28d9dfd5fefe89160e0 SHA-256: aebdf4071ddeeb53d49b8b1a93c8054c38f542778c4ad9cd32524a44daf09668
194 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. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://cctraff.ru/strik?keyword=samsung+multiroom+app+for+mac In PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/ed39ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f87395d2ab42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5f9e56e5b88f8.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/visitaxafixubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f886c70e37f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_5f9f746da56ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5f9ac74c1b5eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8736c5ec74e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f9aa604d07de.pdfIn PDF document text
    • http://%%i:%PORT%/%CMND%In 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/9fa11012-9ea9-4f93-9b9d-7b9e95c82c52/xifiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/ics_200b_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91cd4be0-b56e-42a7-8067-759c5b050e73/columbia_county_landfill_georgia.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/15468380577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effa49cc-4f0e-44b1-abfc-bf7b95835a38/37231938194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e2915c-9d2a-4fe7-beb5-4ca694c6a003/wiwarexinugidoriredi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014c54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C54 28232 bytes
SHA-256: be7d3f5dd64ffa07ad376e0370cd451ebfac440ef49dc2c61939cdc738e6a2a7
font_00_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 5436 bytes
SHA-256: b3fa467aabcb27e0b4b50c35be04c14b04f66b77c0702a29155ebf2ac6979db5
font_01_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 12600 bytes
SHA-256: d83d4202780ad96dad3c25da562241da99209894a4d3b64fbca2d2a9bf7f4f4f

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