Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df673cac9c66760…

MALICIOUS

PDF

41.5 KB Created: 2020-07-08 18:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a5b326c3dfd2e564a61134371e22505 SHA-1: 910cb35d0fbc50cc11414d7b95485831fcbee307 SHA-256: 7df673cac9c66760de6c988e6c48be79841d2a21b0c17b480601d5ab1b287ca1
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on various domains. One of these links, 'https://ttraff.ru/wb?keyword=mialgia%20tratamiento%20pdf', was identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure and content suggest it is designed to lure users into clicking these links, potentially leading to further malicious content or downloads.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.ru/wb?keyword=mialgia%20tratamiento%20pdf
    • http://files.elginparkathletics.com/uploads/1/3/1/4/131406413/xikudenaw.pdf
    • http://files.yourmagicaldestinations.com/uploads/1/3/1/4/131408930/jowuzerajaxebu.pdf
    • http://files.doylestcafe.com/uploads/1/3/1/0/131070112/lifuxum-jupevibubebigo-zedew-menefa.pdf
    • http://files.edsworldwide.org/uploads/1/3/2/7/132740320/sotilemiz-gukixedesimujar-bevulas-lativeponeji.pdf
    • http://files.heartlandjungians.org/uploads/1/3/0/7/130776841/ziniruper.pdf
    • http://files.jjsdka.org/uploads/1/3/0/9/130969819/98a098cf.pdf
    • http://files.dorabramden.com/uploads/1/3/1/3/131382141/3729828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://movevenijeva.files.wordpress.com/2020/07/pejadak.pdf
    • https://vokizowonaso.files.wordpress.com/2020/07/76742748153.pdf
    • https://benozijef.files.wordpress.com/2020/06/44382030528.pdf
    • https://zufudevuse.files.wordpress.com/2020/06/91834034283.pdf
    • https://nadevufitaxa.files.wordpress.com/2020/07/relowodozojupilifemolun.pdf
    • https://zofutemuzup.files.wordpress.com/2020/06/kosilolavowizivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.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_off0000658b.bin
c6e8836f5a4d8dd0deb12006e61f87089a7e0b39f675ca815764952a350fca53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 4976 bytes
font_01_sfnt_off00007655.bin
3dfca5bae12749b00dd915d5bf310f6b2d10052c4d8e01e72d09e1b3e40cdb8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7655 10240 bytes

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