Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a78546dc6ad0ec…

MALICIOUS

PDF

51.0 KB Created: 2020-09-01 00:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eafb893d6667d4ba1ae50f2be7a7d4ed SHA-1: cfd0c2ffe354924c93477b65f34af23501436f42 SHA-256: f8a78546dc6ad0ec33890b8ae1f68fe9865b73b02d2516cd11c850bd3ceaed5f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=answer+the+following+questions+in+brief+meaning'. This URL is presented within the document body, disguised as a request for information. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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.cc/wix?keyword=answer+the+following+questions+in+brief+meaning
    • https://static.usrfiles.com/ugd/bf0735_f15db4f45b764a5db08ddf6688363edb.pdf
    • https://static.usrfiles.com/ugd/162fe6_21b67efee8134c1ebe8fa131fd0eef34.pdf
    • https://static.usrfiles.com/ugd/b8c837_473a88f600f445a1aba8ba4fff4a6b36.pdf
    • https://static.usrfiles.com/ugd/575363_087620da91cf456ab96277387bee86e6.pdf
    • https://cdn.shopify.com/s/files/1/0434/2654/5820/files/torture_games_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/ganewopenitomimagobewe.pdf
    • https://cdn.shopify.com/s/files/1/0470/8807/4910/files/fear_3_trke_yama.pdf
    • https://cdn.shopify.com/s/files/1/0431/4713/3088/files/sugidorivifako.pdf
    • https://cdn.shopify.com/s/files/1/0428/1345/6550/files/90134475893.pdf
    • https://cdn.shopify.com/s/files/1/0462/6143/6567/files/small_group_guided_tours_of_italy.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1314/files/kojona.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c812687292e4fcaa4ebee776ac7fd1a.pdf
    • https://static.usrfiles.com/ugd/b916f4_6cc6d04f0ce245b6be9c2e672bf5b3bd.pdf
    • https://static.usrfiles.com/ugd/7f16bd_5870f64f68d246fb9080d919656829eb.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_74f311d03a8d4920957d0a562b7b2876.pdf
    • https://static.usrfiles.com/ugd/1decf9_7d9c2e13c970460f866e3b03e97bca30.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a86.bin
ca4518bf555cdb071c3a3e192e53682c4dcddae4b7685e686f8b46e8b68d14d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A86 5412 bytes
font_01_sfnt_off00008cc3.bin
8f8cc23b8449e45e3ff54ce4e775cd0a1d71118f9293108eb2c6ee795ce7f789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC3 10692 bytes
font_02_sfnt_off0000b0a7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A7 4324 bytes

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