Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d772ad1a5050824…

MALICIOUS

PDF

47.8 KB Created: 2020-08-31 09:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf7010bd22069c92a449f95d9315fde SHA-1: 305c33cc4d31130b76e7d8d13faa3c01fc426438 SHA-256: 6d772ad1a505082429205b82741bd4e07505439d6e759417ce2fffda3e74566b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=pesquisa+qualitativa+e+quantitativa, which is likely intended to lead the user to a malicious site. The presence of numerous external PDF links also suggests a link farm, potentially for SEO manipulation or to distribute further malicious content.

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=pesquisa+qualitativa+e+quantitativa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_627bd5e6270a411586a7054f928fac01.pdf
    • https://static.usrfiles.com/ugd/b8c837_9697dd7740e74475badebf05d2c73e82.pdf
    • https://static.usrfiles.com/ugd/c0fca2_c8ba039998ee46c283de7b3bff6028be.pdf
    • https://static.usrfiles.com/ugd/b8c837_b11fb9b6e82542b783bc017fea5d10af.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ee56da3962946a6b66980bc93c3630a.pdf
    • https://static.usrfiles.com/ugd/9757e7_51e13546d2c64e1bab83e4f281127470.pdf
    • https://static.usrfiles.com/ugd/6290de_72a4abc04eed4f82b1e8fd3a3c4f2204.pdf
    • https://static.usrfiles.com/ugd/9d869b_1876026c8f7848c498a05b6e4060969c.pdf
    • https://static.usrfiles.com/ugd/2274a7_2344938f2fae46b08750ee222ea9b7d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f20d26694fd4a28b23166445263645a.pdf
    • https://static.usrfiles.com/ugd/5b604d_cb6df290a5754c9bb4500c89e9fefbee.pdf
    • https://static.usrfiles.com/ugd/b8c837_adcf0e3d827b45dfb0d27593129c00a1.pdf
    • https://static.usrfiles.com/ugd/5926b4_469b9548053046f6a18ea512c5b96a56.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_off000066d5.bin
686e92e412e466baa725e380a479ff13884429540e2c6c6b8a29d080c4563fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D5 4768 bytes
font_01_sfnt_off00007729.bin
3bb0ba628eef2b735879c36a3c17c9d9a2280c76100c9e7475d52e4b1b421ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7729 11784 bytes
font_02_sfnt_off00009b2d.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2D 16204 bytes

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