Malicious PDF — malware analysis report

Static analysis result for SHA-256 0642063a700c62f3…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 00:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f761ad6fb4ac42c488e0e44afa82a214 SHA-1: 7f553077db9c9f9b136b9d0b6babeabda083fe8e SHA-256: 0642063a700c62f32eb4195853736d4a2c236bffcdea0ca080021e8164046152
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for software downloads, specifically 'tinder gold mod apk'. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document. No scripts were extracted, but the embedded links are the primary mechanism for redirection.

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=tinder+gold+mod+apk+10.17.0
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/a771bd_bb5d52bdf4e54886ab5be2fb503c863c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1285a1d03aaa434186f99d8ee747aa87.pdf
    • https://static.usrfiles.com/ugd/0dd040_f617421a77fc480ba1bfea098c21b555.pdf
    • https://static.usrfiles.com/ugd/b8c837_9efea030c12f4ddcbf79c469a37b49f8.pdf
    • https://static.usrfiles.com/ugd/c1615c_c8ad0934714c45afb54ad40604b51703.pdf
    • https://static.usrfiles.com/ugd/9219f8_cec770508ffc4e73a24d66dd9264f877.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ecafe7353ed4ead9ff7b02385f5eb06.pdf
    • https://static.usrfiles.com/ugd/b8c837_d45b111e88584da98dea72fcc6a5f0b3.pdf
    • https://static.usrfiles.com/ugd/b4a829_9db135299bc340ee975501f4663fd551.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bff50e9c78c483594f051e38d170046.pdf
    • https://static.usrfiles.com/ugd/74e905_576b722a62ff4711b20d9600c0606224.pdf
    • https://static.usrfiles.com/ugd/b0b521_f7edc04f93b14bd4b8cd6df5aa5f4d11.pdf
    • https://static.usrfiles.com/ugd/c1615c_537529e8724349e3b8513485fcbf8973.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7a6cfca65204dce83d680068a15a65a.pdf
    • https://static.usrfiles.com/ugd/b8c837_96c72e26d7bd44948c13abfcb07eda33.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060d4.bin
8e521f7c0648f438c26721855e44a66b06c0d75324f11979cb957a5dfa494e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D4 5128 bytes
font_01_sfnt_off00007221.bin
0247ec93f9b28f0d4d0616667f05f0d29799edee31beb7e0719c016c4bf69ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7221 10588 bytes
font_02_sfnt_off00009657.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9657 4324 bytes

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