Malicious PDF — malware analysis report

Static analysis result for SHA-256 684318726b59fe77…

MALICIOUS

PDF

43.1 KB Created: 2020-08-03 05:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d00b219e323cad0551b93312fbe2a3b SHA-1: 68aa215e57b2690e575366d598e726cbb4f9332b SHA-256: 684318726b59fe7774eef4e37296064be09e8ea46b96792c547c2323e52b2829
162 Risk Score

Malware Insights

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

The PDF contains a "Windows 7 repair disk download" lure and embeds a large number of links, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links and the malicious redirector suggest the document is designed to lead users to download malicious payloads.

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.
  • 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
  • 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/pify?keyword=windows+7+repair+disk+download
    • http://files.canyonridgepta.org/uploads/1/3/0/9/130969681/82bda9caed5.pdf
    • http://files.speculos.ca/uploads/1/3/0/9/130969334/5438137.pdf
    • http://files.yes-to-adventure.com/uploads/1/3/0/7/130775368/marevam-mozebedu.pdf
    • http://files.pflagladylake.net/uploads/1/3/0/7/130775679/walidupapewux.pdf
    • http://files.churchilltimberworks.com/uploads/1/3/1/4/131408954/lekinuxid_kixor_davuzalesugo_vonedibuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/63349835138.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/67659413242.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/89313120643.pdf
    • https://cdn.shopify.com/s/files/1/0435/6607/1971/files/genie_pro_88_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/gorofivik.pdf
    • https://cdn.shopify.com/s/files/1/0434/7510/7992/files/rename_a_column_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/xolanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulanevu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1736/files/16655443343.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/laxexalujavuninigaxunusu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7204/2661/files/xeletuwejotu.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_off00006b09.bin
1b814f01e0cd7ab528b75656e2af3d93dcd65f2eb71b2186ded790b2a61549f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B09 5200 bytes
font_01_sfnt_off00007ce7.bin
644061313478c1994ebf287f789fcc81282fffca3dd2a6287c5d65514d5090ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE7 10456 bytes

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