Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e114c7cc372b632…

MALICIOUS

PDF

34.0 KB Created: 2020-09-29 20:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23c29597b8b5c4e6bbc25bb56028441a SHA-1: a0b608ec8d6b31071fc0cea440c6276f387279db SHA-256: 6e114c7cc372b632dd9e0676270364c84ca62282605dec0bbafc77e3bfe54cb5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests an attempt to direct users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/strik?keyword=waltz+in+e+minor+chopin+pdf
    • http://files.rejuvenatedsoul.com/uploads/1/3/1/6/131606309/suninulubux.pdf
    • http://biberexi.wateraerobichaircover.com/uploads/1/3/1/6/131606066/923826debfffd6.pdf
    • http://files.rootstockcounseling.com/uploads/1/3/0/7/130739528/2407847.pdf
    • http://metogudi.memphisescaperooms.com/uploads/1/3/2/6/132681579/f5286272bee7809.pdf
    • http://files.servingthesouthbay.com/uploads/1/3/1/4/131437532/wuwetuzulekubi-xobeforor-pidiluvojikiz.pdf
    • http://pizogo.ejwillisblog.com/uploads/1/3/0/7/130739978/4455542.pdf
    • http://zibogifej.xirong-lin.com/uploads/1/3/1/4/131437736/ketuk-fazav.pdf
    • http://kedotuli.ledupcanada.com/uploads/1/3/0/7/130776483/zaviralatodala.pdf
    • http://fiman.martigraceashby.com/uploads/1/3/2/6/132682883/dozegumepo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/07795b71-deb3-412e-9e03-fbe4fe08bc88/13209192474.pdf
    • https://uploads.strikinglycdn.com/files/7c906999-f8fb-477c-8f74-963923156fe7/78705692573.pdf
    • https://uploads.strikinglycdn.com/files/55c04867-b5cb-4afb-a324-ea4a790de8c5/97388097102.pdf
    • https://cdn.shopify.com/s/files/1/0482/6700/2018/files/sakura_con_2020_dc.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/47981629104.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/44382040646.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/benchmarking_in_business.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4687/files/mebume.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_off00004711.bin
ca59e5a40f0e7383d69f799c99b7032850a83eb53ce63d7cca4c9b3c90376945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4711 5280 bytes
font_01_sfnt_off000058f3.bin
37c67884286e953889c15352e7d43e9b94984cb48ffad0442b73dff29ccb8e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F3 10052 bytes

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