Malicious PDF — malware analysis report

Static analysis result for SHA-256 7463b854bf7a6843…

MALICIOUS

PDF

46.4 KB Created: 2020-08-30 18:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16e6a9dfaa3e476607e3053fb88a7b45 SHA-1: 675d4991f031476fbe730c898cbe16e8c8c1303f SHA-256: 7463b854bf7a68438761ad4821f5be624d57cce9f4420e762e3b03dfbe77be26
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for malicious content. The presence of numerous links suggests an attempt to distribute malware or redirect users to malicious sites, likely via a phishing campaign.

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=mp4+free+porn+videos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5ecadc_51aa337b9f524951bd919e7a28c58a4a.pdf
    • https://static.usrfiles.com/ugd/be19e1_1754db4daf5142aaa5ff80d438ef15b2.pdf
    • https://static.usrfiles.com/ugd/9dda13_eecc8527e81b4504aae2522b121eb57c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c61a0aee4fac4d42a7e57be25f962646.pdf
    • https://static.usrfiles.com/ugd/23e9be_6502e734e6704028abbdbae5dac9461e.pdf
    • https://static.usrfiles.com/ugd/b8c837_321e63a406674f84b0232b4cc4073adf.pdf
    • https://static.usrfiles.com/ugd/b8c837_efec9eb68e56477fb6a6a8eed6735244.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc7f93e8b811467cb0ed3ad494484435.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4fa1653ca33411caa31b1ca406e597a.pdf
    • https://static.usrfiles.com/ugd/affb4a_95b9e2d5ef8b40c587fa7b4925e2f8ca.pdf
    • https://static.usrfiles.com/ugd/269bb8_97f99232eeeb42d69ff7ef7ca75e2802.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6ad5c6885594950ac3b8735acf93018.pdf
    • https://static.usrfiles.com/ugd/be19e1_37c7beb8a72b449582988b9194e87fca.pdf
    • https://static.usrfiles.com/ugd/bae363_334cee5d54e949d09b5c976ce41ea47c.pdf
    • https://static.usrfiles.com/ugd/99965f_69a2dc3dcbad4c77b4156711de7859ba.pdf
    • https://static.usrfiles.com/ugd/1f2646_2bad5e16370e45d6b980873b0d8e8746.pdf
    • https://static.usrfiles.com/ugd/b7ed05_6dd6935bd6fc4ff6bd0b19cd177da84b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000773b.bin
4624bed3832371672fec7fd1c5869ac8f906f779d0dfa477298332ae21239a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773B 4944 bytes
font_01_sfnt_off00008830.bin
7c3b0e541e26c84ef9dd677ccbaa795b4798d9ed792cfd7e17ed637067960b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8830 11184 bytes

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