Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f854f134377783c…

MALICIOUS

PDF

44.4 KB Created: 2020-08-29 04:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31cd2893b6116e63f89103a17e7bd11b SHA-1: 9853e6b8a2e60159230307383949bc899b89a9a7 SHA-256: 5f854f134377783c0e1d38fbc79966f332d9038e5927541bc49725fcc0b6140d
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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=sweater+weather+acoustic+mp3+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8aa41ffa18ba4e1197b953e9ff1370bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_5428e0bdcff242df9558c1964139c32d.pdf
    • https://static.usrfiles.com/ugd/b8c837_85bfc16cb0504b2493b0acb7c974f895.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d9ffaeceb504c518a6638ab40a23277.pdf
    • https://static.usrfiles.com/ugd/b8c837_3333b93d602148d5a90ff195de6b3302.pdf
    • https://static.usrfiles.com/ugd/b8c837_36c78c968f154f5b879f84f6daa6a2bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c60dc9215f24256a5f9b967047a8e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d50b7e52fc346ba9299f91c652bb6f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_05d5040985d642f49455785083da860d.pdf
    • https://static.usrfiles.com/ugd/b8c837_912569e4c4bb43e8b098a71aeca5d8d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d561bd7e3df411cb018252ae87adcdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5d8e7434cde4aca898148b5cf1aa115.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/19119850978.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/sesabibixafanofiburozozod.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/sovikenurem.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/doom_and_destiny_advanced_walkthrough.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fe6.bin
8b77b3a60081c661b95c60ba5a7a47530e1e32ed79bf73fb69e42ac7cadadea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE6 5672 bytes
font_01_sfnt_off00006311.bin
ae1265b6a1b8daa749f3d1de9a3dcb6dd2067322d2c814d6b8714dd05fa24bfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6311 9804 bytes
font_02_sfnt_off000084bb.bin
9e8409b995ac2b0bb76eb3eb8dd1c90fa55d1c1c8a40bb5daa08ca4080948d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BB 18776 bytes

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