Malicious PDF — malware analysis report

Static analysis result for SHA-256 93896b1866ab8061…

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 09:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd4de804ee627f54f4c0956622e67fa9 SHA-1: 2661025b2632c4610fd9dab2eccffcc2f8471108 SHA-256: 93896b1866ab8061f0cdd1bc62a8f306598a7df9f878ddf7fe472ae363f961ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external links, many of which point to a domain associated with SEO spam. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL, which is likely the initial step in a phishing or malware delivery chain.

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.ru/wix?keyword=d%2525C3%2525BCzg%2525C3%2525BCn+do%2525C4%25259Frusal+hareket+sorular%2525C4%2525B1+%2525C3%2525A7%2525C3%2525B6z%2525C3%2525BCml%2525C3%2525BC
    • https://static.usrfiles.com/ugd/eb6612_4194cbe85ac541fbb237e84152d834c5.pdf
    • https://static.usrfiles.com/ugd/429b25_6aadc2bf69174851abab10489f3f3d0f.pdf
    • https://static.usrfiles.com/ugd/c1108c_96590f6637f945fb83b0f9b3884fc53c.pdf
    • https://static.usrfiles.com/ugd/0a593f_9f0a193b0b914da0a8599b09487d8f65.pdf
    • https://static.usrfiles.com/ugd/d1d005_1d94aeb02c254f3fa5062b813bd5aa54.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_f2d25d55333e4ec5bf9478f058390d51.pdf
    • https://static.usrfiles.com/ugd/83e24f_43e97772692242679127f04b84fb5906.pdf
    • https://static.usrfiles.com/ugd/b8c837_00fd6fd250e344899e16bdf1cfbd0b62.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_e8e2cbab15e4496cacb9acf95f62184e.pdf
    • https://static.usrfiles.com/ugd/4dd980_d967dc0dcec745ddb5739149d7b49845.pdf
    • https://static.usrfiles.com/ugd/b8c837_c56c23667a3c4f32b15b664030b16ee7.pdf
    • https://static.usrfiles.com/ugd/4d400c_48d0d81e6ba349fb8cc98fac0b1cabeb.pdf
    • https://static.usrfiles.com/ugd/e4ff69_8019773c7ae24158a8242487d69b9ca2.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffe5f4d356c04db99c343782e2aaf3dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_75215d55ffe24d41beb6b5705f61ffa5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f2c.bin
f4e7cc04d0cbf244f585b528846f43fa030572d8d8c8ab7d5a47feae8682b570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2C 6052 bytes
font_01_sfnt_off000062ae.bin
ee967336568f77ff61a5ae04097864f25fb24cf77b94457ab20e22408cc95c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AE 2252 bytes
font_02_sfnt_off00006c16.bin
619373a321e57738e2a4cb98733d9195dee100d8f7816d815e77f63faacdfd1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C16 10680 bytes

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