Malicious PDF — malware analysis report

Static analysis result for SHA-256 745b897680b298f0…

MALICIOUS

PDF

38.4 KB Created: 2020-08-29 11:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d78d1a245d1455563dadbcdbf343c9b SHA-1: e7cde8ac0bb9ec597675446eb2c027c6de212b52 SHA-256: 745b897680b298f01c30f7159f1b88cf0a51f1ac180e4736cbab148e9eaaa7eb
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body text, though heavily garbled, contains a string that appears to be a lure for downloading MP3s, suggesting a phishing or scam attempt. The presence of numerous external PDF links further indicates a link farm, likely for SEO manipulation or to host 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=who+dat+jt+money+mp3+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_192c92c0d559484dac893d6c930670a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c37149fb4284a5ab6f438377b4050a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_75ba2b75efb54c2ebb19e4767196e22d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf34964ee53040f0ae4f55e428970441.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd09c383339a480bb46b21b5c0a4a224.pdf
    • https://static.usrfiles.com/ugd/63d3ad_8a30e3fa1efc4d118938eabdef39f249.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b02eeaa05704768a4dc0be4137c9f2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_70aacd58c37a44dcb7a9985d0aba8afe.pdf
    • https://static.usrfiles.com/ugd/b8c837_57a055deee8445489e7134244864cbe1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0331eb4ee9540348f9be31056ac4d6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7807c67147024923a9a68799d7abf13d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e62dca9eb4164cc580e4e8856dd25dcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_dad603711759498baecad27aba6bcb64.pdf
    • https://static.usrfiles.com/ugd/b8c837_13949a42db8247f8b44fcf2be7f40b70.pdf
    • https://static.usrfiles.com/ugd/b8c837_e71686ae0bf54d148562e98766d6f469.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_off0000576a.bin
45e692443af527f527e553d9dbfe0c3329eed745690aeaac3da2b8005c08c532
pdf-font-stream PDF embedded font (sfnt) at offset 0x576A 5372 bytes
font_01_sfnt_off000069be.bin
5c5c5493ab5aa006066ff0670adbec830616d7778e7d6ea6d3e5c1f4ce70e045
pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 10220 bytes