Malicious PDF — malware analysis report

Static analysis result for SHA-256 6926389c071c1388…

MALICIOUS

PDF

41.1 KB Created: 2020-09-19 01:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5c43c9224042b7b96ca009a1b7e5ca6 SHA-1: adc2c91dbafebe13d0cbf52c32e95eb61b83464e SHA-256: 6926389c071c1388577a79e55bb81fdb9ff11b888f03f12e97c24a0a72771628
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=tiny+troopers+2+apk+mod'. This URL is presented as a download for a game mod, indicating a social engineering lure. The document also contains a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier strongly supports the malicious verdict.

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.me/wix?keyword=tiny+troopers+2+apk+mod
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3027/3434/files/runalev.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4053/files/kvar_calculation_formula.pdf
    • https://cdn.shopify.com/s/files/1/0431/0676/2903/files/pmf_vs_vs_cdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7228/9942/files/bileik_ve_formlleri_7._snf.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3901/files/prentice_hall_geometry.pdf
    • https://5f54694e-24c6-4aa5-8a78-dda47e7bf3e8.filesusr.com/ugd/941881_c7bceda330ea462088e138dc3f516005.pdf?index=true
    • https://3cf94cfe-ce89-4375-977c-5ea2e3e83483.filesusr.com/ugd/964009_5431b3b58c284549bde03f25492f05ee.pdf?index=true
    • https://f83eaae8-e95b-4d08-9a21-b73d8d7a3107.filesusr.com/ugd/e32576_f27a50c1750d46bb9f567b8eb6b3452a.pdf?index=true
    • https://9c1f16e8-75b9-40a1-b80e-43b96051dcc0.filesusr.com/ugd/3be48b_e11b959d8ad24c26b7479368f589c4a4.pdf?index=true
    • https://0998b24d-daff-4c9c-a56f-098f25f76cb6.filesusr.com/ugd/7e84b7_2f2fabd158064afb858201975ae37308.pdf?index=true
    • https://24135e7a-83db-4635-9db1-e1a0c23e8c64.filesusr.com/ugd/7ff653_e6e51dc6da4b481894aa9800c3fdee0d.pdf?index=true
    • https://3efd1f08-d0fc-47ba-b50a-36ff87c8680e.filesusr.com/ugd/79e5df_dde150299c504520bc2b337c8c24f8bd.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_off000061f7.bin
ab00563700ed8f6cc3acd704186dc88056fb06c1fb7f175b46533dcbf3f0b019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F7 5320 bytes
font_01_sfnt_off00007404.bin
4131d8fdda006d0757fb3f853bb3033e37d8c06de2d22ce596caee69c535822a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7404 10388 bytes

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