Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3590f8b21154010…

MALICIOUS

PDF

51.2 KB Created: 2020-09-10 04:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 46cc877b9824cd88649c5701ff6e87f4 SHA-1: dcc9dcac1f805be2f31d4e671985ebb489bde88f SHA-256: b3590f8b211540104d59560dd637f3ff5948833e5e60ddb16d0417bc2f871769
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One prominent link, 'https://ttraff.club/pify?keyword=devil+wing+quest+ragnarok+mobile+guide', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting an attempt to drive traffic to malicious sites under the guise of providing a game guide.

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/pify?keyword=devil+wing+quest+ragnarok+mobile+guide In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/90423f_e5270bc983a84a5699cbe06014b0a5e0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/18f527_839e88cfde7640b0933ac8f43cabdf03.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2b3f46_d7a8c93214404e6aa647607feb258a5d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a298ce_8cd33e364fae4d9486152f3e2c9736c8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_0a42262263df4cbd8bf878a3eda5f33c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f2ef67_c798e5d356c1455baf8642dd718a8d28.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/accd1f_a94c643927714842906ab9383dad1f46.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b6edda_1df0e91c88c245449ca980805dd35a2e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c1108c_c31610adbd8243a19f278177a6b0a6c4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/299074_af51d57313054f6baf2be499571b35d8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ebbcbd_fa729ac8eaab442f9f72d4cd19dfe2ef.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/724bd4_4f6a9377905a4b3c9009a36fbd045054.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/145364_034b6ec9978b49e8b79889510ce9469e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c0a468_0c0e9b841c304661b8e6c48cc1369f1a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7ea8bb_efbf41c50f844a6b9819de840e262667.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3aca14_67b39da8ba144033a0e3ef41c254cc11.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e4ff69_cf6a6e1b9b53488c8481567fd664765e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a86d68_000adb97d7e147138a4681733a358b76.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D1 5628 bytes
SHA-256: 8475401e7e2351036fa25e277eb0835ff16bbbbb8a068c1625a2c53881cca33b
font_01_sfnt_off00009af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF3 11060 bytes
SHA-256: e8745a1c6d8a7f583e865b94424c48e12a65a06d31de5ef99315cf4a2bf8379d

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