Malicious PDF — malware analysis report

Static analysis result for SHA-256 2576a5a2d1eb25d4…

MALICIOUS

PDF

53.4 KB Created: 2020-08-31 04:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e05e0fd411a173ab8f4ba316a5352ace SHA-1: 5a13cd0e2b34d5b2b6ded8acfc98f0f7b9d2e27a SHA-256: 2576a5a2d1eb25d43801b16204d8ff0123b7cf2d878e6d9687e7f64cb94de118
154 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or redirection strategy. The primary malicious URL identified is 'https://ttraff.cc/wix?keyword=medical+terminology+made+incredibly'. The document body, though heavily obfuscated, contains this URL and other PDF links, reinforcing the attack pattern. No scripts were extracted, but the presence of numerous links points towards a social engineering or redirection-based attack.

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=medical+terminology+made+incredibly
    • https://static.usrfiles.com/ugd/b8c837_8760f83c6d9e438c8930dca21a1b05d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_7547b62a960b4f7ba97de62b12829a1d.pdf
    • https://static.usrfiles.com/ugd/6846fe_16830775fe384478aaf7a8ba587b253b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b359b70a38546b595ae3e3631734627.pdf
    • https://static.usrfiles.com/ugd/b56239_2c8da5972e224350ab10a3571cfeb32f.pdf
    • https://static.usrfiles.com/ugd/3f4b99_0dabf9fc14714423a34e56df1d540073.pdf
    • https://static.usrfiles.com/ugd/a86d68_6c7c658f82144e2ab2402c4d590394be.pdf
    • https://static.usrfiles.com/ugd/8b4172_7e69abeccc8d47509d899ccc360d1648.pdf
    • https://static.usrfiles.com/ugd/33a16d_9f4349b7c18a4397b4d5dfa7c926c566.pdf
    • https://static.usrfiles.com/ugd/8127dd_6c923865aac04507ab7a80d3a4b74d2d.pdf
    • https://static.usrfiles.com/ugd/8dde66_a7fa0f4550ba4483a332726e0258738e.pdf
    • https://static.usrfiles.com/ugd/61804c_74d6b4707957484cadf985562aaddefb.pdf
    • https://static.usrfiles.com/ugd/353d00_5024c9e338ac45dca0769aa08786d4be.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b2801f4ef954e06afde1a49b0f6e3d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea71c40b953e43ccac0318b398318834.pdf
    • https://static.usrfiles.com/ugd/32acb1_964d2224ea564a2fb37dea1e9e13235f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b23.bin
42e692dc4281a6111f0e01596089baccc365247f7207ad6e600909bf24dc53d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B23 5328 bytes
font_01_sfnt_off00009d31.bin
9742229a7d5f2e7130b1ea4c41fc948199964b19269a492e90424f7c0e6f12fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D31 13784 bytes

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