Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b327098365d410f…

MALICIOUS

PDF

48.1 KB Created: 2020-09-17 08:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1111d6808b08c50623b65502d9bf4873 SHA-1: 4260a81b11d038cd229e99695ce799ecf675ec0b SHA-256: 6b327098365d410f14a4e1af31d1ee6392329e1adf8f7096811e5261d63d485b
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, with one link identified as a malicious redirector. The document body and embedded links suggest a lure to download an APK, likely a malicious one. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector and a link farm designed to distribute potentially harmful content.

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.link/wix?keyword=todo+apk+download
    • http://files.tci-charlotte.com/uploads/1/3/1/3/131383549/616cfc4c0.pdf
    • http://zatigu.addysg-ffalala-education.com/uploads/1/3/1/3/131378950/d99d7b8d34be7.pdf
    • http://lileza.laplayaatthestrand.com/uploads/1/3/2/6/132680981/gumomuraxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d893309-aad6-437a-b94c-eceb1e8b11f1.filesusr.com/ugd/04e6f9_491bf85ea7c24178a06ec00bc42caeaa.pdf?index=true
    • https://eafa7026-a984-4033-a970-a28c173b6c34.filesusr.com/ugd/f14cf6_d585124a7cff405893efe2c850803eda.pdf?index=true
    • https://91096db0-a37c-45f1-a84e-946a48c5b515.filesusr.com/ugd/7a359d_2a43076f7ea74832a06722a2d60b00fd.pdf?index=true
    • https://5205a1fe-e84a-4efc-9531-8be733e968f4.filesusr.com/ugd/81cd61_36aa3531f8ac485fa297f97a10e3b987.pdf?index=true
    • https://b5602a9f-7d32-4e80-8f2d-7f80397e5b17.filesusr.com/ugd/36d413_01bc2b83a23e4587ac4625b39a0b7555.pdf?index=true
    • https://c9a59e04-08be-450e-90ac-358dbac6086c.filesusr.com/ugd/01f9b9_8ef496a8e305491f9e4c41c9963ca290.pdf?index=true
    • https://fe210293-dae2-4081-bda7-950af5a4bb86.filesusr.com/ugd/7f46b5_c03441dfb50744c1973f868de45a9e15.pdf?index=true
    • https://9218f8ec-64bd-443e-bf52-7b5702e45e1b.filesusr.com/ugd/f6336d_badb13425b5e487aac9be4b8c389abee.pdf?index=true
    • https://630cf15f-3879-4ee0-905a-9c1ae15721e0.filesusr.com/ugd/9f06f8_f4b288c204b2496eb176d2dc4eac672d.pdf?index=true
    • https://eed85539-51a3-40b6-9885-55a113a05e84.filesusr.com/ugd/6e13d9_6a123018355343eaa08f0995e916ca43.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008f51.bin
e4869096e5f1b25d5adb1dcf863aee6ab2560edd48098b34ed716fd63de8e2a5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8F51 21828 bytes
font_00_sfnt_off00005876.bin
23ec4af4d4fb518126b013b16d5512bdaea8bbc8b943cb0ab70006690f799d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5876 4784 bytes
font_01_sfnt_off000068e5.bin
7ac029bea809ccb6b6b70bc883f295a56556f98db619326ea2ab6e7d72573fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E5 11656 bytes

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