Malicious PDF — malware analysis report

Static analysis result for SHA-256 6850490c6d054082…

MALICIOUS

PDF

57.8 KB Created: 2020-09-16 15:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23d06f843673a71f7116f0975da99d15 SHA-1: 57ea614cb17cdd0e295322f7869c512bedaa7aaf SHA-256: 6850490c6d0540827a53797c9a8cb241eb295d3403cfbe684f7495ef9c4be24a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, with one prominently pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to external content. The presence of a link farm indicates an attempt to distribute malicious content broadly.

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://ttraff.club/wix?keyword=pathfinder+kingmaker+song+of+discord
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fb8e10f4-1354-4b64-84c4-40b0c32f6d07.filesusr.com/ugd/eb6612_45a9524f9f8d462cb7e1e5b77ac47ef0.pdf?index=true
    • https://1a625630-568e-4cd1-bad9-17ef499c9c04.filesusr.com/ugd/e948c1_18505295c53647269fbbb0c9d21be8bd.pdf?index=true
    • https://311202b4-e1d8-4a4f-a261-9961cda67191.filesusr.com/ugd/cc3ca9_00f5655f20d34ca7a39b481ca89b463a.pdf?index=true
    • https://267c448d-f37c-459a-aa1a-9a0ee3fc7fad.filesusr.com/ugd/0582e0_98258fe0f1f14117b5500c0fd717f560.pdf?index=true
    • https://652de5c0-acff-407f-9ac4-af943cdaca31.filesusr.com/ugd/f65518_13478a8e5db54839b33aa9f1b2755d18.pdf?index=true
    • https://0784ffe1-2c75-4987-ab51-6d0817367522.filesusr.com/ugd/440e29_ccd527c357924342a127137e3a0925dd.pdf?index=true
    • https://dcca849c-17cc-4a93-8611-a574194ca3d0.filesusr.com/ugd/1cc777_764281f811b04380bb015120ba17cd48.pdf?index=true
    • https://2532a4da-6839-40ea-a26d-1d5260e193a9.filesusr.com/ugd/eb6612_ca88e87f63ca4f63b6fc341ab4292c54.pdf?index=true
    • https://a6352c99-ca75-447d-8ab4-724f6d4c7257.filesusr.com/ugd/0582e0_1407ab599d25465bb6e1674e8907c575.pdf?index=true
    • https://df77e081-7c41-451c-aaee-c1ff929adfa8.filesusr.com/ugd/3e5db3_ee0d0a3c9fa54a4aa77aea647516095e.pdf?index=true
    • https://b9ab8974-c41a-46a5-ae8a-4f750516ecf1.filesusr.com/ugd/610d21_6a43fd3e9a58455b8c9599a96c3c42f8.pdf?index=true
    • https://eb58a354-ab1e-4d27-8d5a-7c8a4462de6e.filesusr.com/ugd/3be48b_67985589d503456daa46ae1ac5fd26fa.pdf?index=true
    • https://6e3faa45-a423-480a-a50f-b1ed98fbdd8e.filesusr.com/ugd/e643da_70d80d78b58f48dabbc0959979cc2c3c.pdf?index=true
    • https://68221b14-34f9-4c1d-a01e-27c8e32c0eb2.filesusr.com/ugd/bc0b97_4b023ac9756043e99a4bbd296d6788d7.pdf?index=true
    • https://8b726498-925e-410f-97bb-fba0b6c6078e.filesusr.com/ugd/70e7d4_19268f7e5e3346268497302d9748b9fd.pdf?index=true
    • 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_off0000a3be.bin
85569d2acba4c6adff341304ed1d3c78dcb39b103686c4ea17e0785419f044ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BE 5468 bytes
font_01_sfnt_off0000b638.bin
f5b6563d207c9771ed089b596032e9ec078c0db14395f84416eaab57a75af041		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 10676 bytes

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