Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdbd8a3e8d93733…

MALICIOUS

PDF

48.6 KB Created: 2020-11-09 01:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34e5784f938fab19d93f276fe32aab68 SHA-1: 52e5e695f12454bd5e774dc7e23514085175335e SHA-256: 5bdbd8a3e8d93733ce18e51370288c1c55908ea60faffa97d99aa937b04c4dbd
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content distribution network for malicious files. The primary URL, https://trafficel.ru/123?keyword=slender+man+unblocked+download, indicates a lure to download content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content or download further stages.

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.
  • 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.
  • 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://trafficel.ru/123?keyword=slender+man+unblocked+download
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5fa50cc01bb16.pdf
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5fa65984c62c1.pdf
    • https://woluxivevarot.weebly.com/uploads/1/3/4/6/134672831/mamumukiburokove.pdf
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fa62ded48020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/julaxel/27168532469.pdf
    • https://uploads.strikinglycdn.com/files/85e9bf36-a688-4ca9-bfda-0488cc5b56a9/nopugobibarokudejewo.pdf
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdf
    • https://uploads.strikinglycdn.com/files/b827ea83-50af-4223-be10-8522fef218d3/71066070353.pdf
    • https://s3.amazonaws.com/liwafo/wanupemegekemu.pdf
    • https://uploads.strikinglycdn.com/files/3ba9dc1e-cdc5-45a9-8b91-0c60d4e8edcd/sagupomab.pdf
    • https://dusurujadexo.files.wordpress.com/2020/11/sgt_john_curley_live_pd.pdf
    • https://s3.amazonaws.com/lovetijif/best_two_part_harmony_songs.pdf
    • https://uploads.strikinglycdn.com/files/1b19f40e-4dc5-49c6-a4c8-020b132dbd2e/xukijupagup.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/
    • https://s3.amazonaws.com/lovetijif/best_t
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000708d.bin
2557d82c3bdae3a5324cc90016cf78cecd056c5a2685592cc28a86c9fca64491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708D 5060 bytes
font_01_sfnt_off000081a3.bin
b5696ae3138f7ce04c330ee55fcb9a8d63745c0ee24a4bef59bc8aea4ba4681e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A3 11316 bytes
font_02_sfnt_off0000a758.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA758 4324 bytes

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