Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adc700c2c69396b…

MALICIOUS

PDF

66.1 KB Created: 2020-12-02 10:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86cdea867b18c7ed4c9c746a5d0963fe SHA-1: 4f93d6f73485a3c25df6bac725d9cba7256db4fe SHA-256: 7adc700c2c69396b8f2c0c5a7a25502434db57db92508729198faa70615d3ea3
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, with numerous external links pointing to other PDFs. One of the primary URLs, 'https://trafffi.ru/aws?utm_term=fishing+report+nj+freshwater', is presented as a fishing report, suggesting a lure to attract users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and link farm behavior are indicative of a malicious document designed to distribute further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/aws?utm_term=fishing+report+nj+freshwater
    • https://gitijekukojijot.weebly.com/uploads/1/3/4/6/134626905/3ea7a.pdf
    • https://cdn-cms.f-static.net/uploads/4471706/normal_5fbd8e70cee54.pdf
    • https://dunujamovexen.weebly.com/uploads/1/3/4/3/134361976/tawatekizipoponovu.pdf
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/2506891.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gupuso/juwawanowazejibew.pdf
    • https://s3.amazonaws.com/xaliwalufoguni/66947459582.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/ranowezibuzo.pdf
    • https://s3.amazonaws.com/buxoparadazegu/indian_blouse_designs_catalogue.pdf
    • https://s3.amazonaws.com/zalomi/besejamazoratimop.pdf
    • https://s3.amazonaws.com/vudivuzakal/mhw_iceborne_gunlance_guide.pdf
    • https://s3.amazonaws.com/godewumazek/lookout_app_download.pdf
    • https://s3.amazonaws.com/mikibetiv/herringbone_mosaic_tile_sheets.pdf
    • https://s3.amazonaws.com/vovopafubipu/lotegekonubebatosego.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d5.bin
5b24745243d0e18c53ad2860a38c8e9d2ae5d11dfceb5e9fa5c0cd23b00c13e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 5252 bytes
font_01_sfnt_off0000d9cc.bin
af2b4fb0cfaa280c89653418fe3967775e27664770e06ef1ebfb171e67080f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 10056 bytes

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