Malicious PDF — malware analysis report

Static analysis result for SHA-256 666acea4734da895…

MALICIOUS

PDF

42.6 KB Created: 2020-09-06 03:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07a57a1952c264baf415a9698ce35cc0 SHA-1: dc38380927e64c6c93f90908a0147c5f9992a98b SHA-256: 666acea4734da895bd8dd5b54a6c84957b921836d85b1e3fd614e0bd449f147f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The presence of a malicious redirector suggests an attempt to lead the user to a compromised or malicious site, likely for further exploitation or phishing.

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.me/pify?keyword=movie+soundtrack+piano+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8b2c09_7b9e289297d8403f92ba491e7d1087b3.pdf
    • https://static.usrfiles.com/ugd/81d6a4_f0bdde59aa92455a8248c7a31cb6efcc.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_69e5930259c441faac6bad1c95e51a34.pdf
    • https://static.usrfiles.com/ugd/4ca7f5_28a61e2c62ee4ea1ab251cec85fc6ad6.pdf
    • https://cdn.shopify.com/s/files/1/0434/9843/8820/files/happy_birthday_fonts_calligraphy.pdf
    • https://static.usrfiles.com/ugd/9e41f0_557c3e8932a54ee88b0041af98fc5d82.pdf
    • https://static.usrfiles.com/ugd/9b5f63_84e4bf536a7f4040aaaf87c45cab44a7.pdf
    • https://static.usrfiles.com/ugd/d1c05f_e9bd7d4194e445ff9c426f3094a18c08.pdf
    • https://static.usrfiles.com/ugd/df4650_3ab52f70bb9a4920b1cd4e72a020694c.pdf
    • https://static.usrfiles.com/ugd/4479ed_784c2fc5675e4eee93726f6485e89f5d.pdf
    • https://static.usrfiles.com/ugd/be5703_8fa470befc3941edb9cc93785a881cb1.pdf
    • https://static.usrfiles.com/ugd/6f58fb_c3f4ab2b1f9c4ad5998bc0eec8f2ceca.pdf
    • https://static.usrfiles.com/ugd/278743_05f50691f06743aabf181ff23543fa45.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_off000053ee.bin
fe2e1aed2a5a1f1d02baf19ccedec4854d30a31dd586b3aa0d5fcfd4ce21413e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53EE 5412 bytes
font_01_sfnt_off0000663c.bin
69a47a5885377b0b4bd8da0db68fdcc996d6378f49f05ce85c21629775e56a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 10028 bytes
font_02_sfnt_off000088c3.bin
d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88C3 16060 bytes

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