Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a49d92b7cc57d96…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 16:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac0df20e8330604282947c69cc096c92 SHA-1: 100c7b3af9a99f0070e6312e639456de3e22b4af SHA-256: 4a49d92b7cc57d96b30441086b47f34392ea1ddd5dd49694451acbd89d7ebc26
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, indicating a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=mcfarlane+figure+price+guide. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, suggesting a lure to external content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/wix?keyword=mcfarlane+figure+price+guide
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/fulujusudiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3975/9255/files/jodifikefitezagobe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/bodybuilding_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/90092404925.pdf
    • https://cdn.shopify.com/s/files/1/0433/0382/9657/files/alluda_majaka_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/ragenevu.pdf
    • https://cdn.shopify.com/s/files/1/0448/3599/5808/files/home_michael_buble_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/kowabexiwefanu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/77340540381.pdf
    • https://cdn.shopify.com/s/files/1/0440/8947/5237/files/11510913728.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_dc700462c7194e43bf4108d1d79eebf9.pdf
    • https://static.usrfiles.com/ugd/09273f_b7e1b095049a42398258901c37bef5d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5708ec81aa04e80abf8143ce2ac87a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f38d507272ba4bb5ac3f24534b1883b7.pdf
    • https://static.usrfiles.com/ugd/aff7ca_81e52b826589493989efb54dbe972b18.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c5.bin
c013d38d53af156ed6fd28a69652bbbb93b1cba29b56d4cf92113a35c8faab2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C5 5152 bytes
font_01_sfnt_off00007554.bin
8f8a24b4fddfa822019f192d5f19451321e11b7bb74497d709ede14dcb10baaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7554 10368 bytes

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