Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7cb31916e01a88…

MALICIOUS

PDF

56.2 KB Created: 2020-08-31 01:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82eae8e9c6ad606e384075e814837fa2 SHA-1: 2dfacb81fb971b90e26d4671898c720f0743c4fc SHA-256: 6d7cb31916e01a88fa3b4e83c6b7de96017b25fca2db3559886b720a4194d43c
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link farm of 26 external PDF links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Binbir gece masallar1 karakterler' and a URL that appears to be part of a SEO link farm strategy. The primary malicious URL is ttraff.com, which is identified as a redirector.

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.com/wix?keyword=binbir+gece+masallar%25C4%25B1+karakterler
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e32576_fca135aaf2a24327ad32b7425ccacc79.pdf
    • https://static.usrfiles.com/ugd/3bca44_9511f0f4aa524e4c958eb902446f4604.pdf
    • https://static.usrfiles.com/ugd/5af86b_50352ae6d1b14a3e83d1957f654c75d7.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/android_9_secure_folder.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/amman_tamil_movie_climax.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/2801166337.pdf
    • https://static.usrfiles.com/ugd/0047a4_d50c715e350149d2ba4681486a0c861f.pdf
    • https://static.usrfiles.com/ugd/b8c837_39f7dbe0cd854a7083df6d2543a5a8f0.pdf
    • https://static.usrfiles.com/ugd/a86d68_95f9455634f84a209143f968d56999a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8725122567ee40dab0aea424436dcdea.pdf
    • https://static.usrfiles.com/ugd/70a38d_558301255003444985b4b52404558414.pdf
    • https://static.usrfiles.com/ugd/912de2_dddf5ac349bc47349fbc99e337d73c7c.pdf
    • https://static.usrfiles.com/ugd/934fc3_ff523a36e77b499abdf2701aae6d112f.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ac8a.bin
31ca0bb64f59ff2ce2c7225071621fa5b2ef65565b0f4867468226dd1c904282		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAC8A 21588 bytes
font_00_sfnt_off0000752c.bin
7f7c9e1543660deaa76382952e246a43f5ad3b8ed29ff4afa4cd8b4ff6567d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 5404 bytes
font_01_sfnt_off0000876f.bin
f88fd412e16f96abe279cd95332fa1ebd56bc833ba1443dcac22752100215545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876F 11924 bytes

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