Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c876c2b861375f…

MALICIOUS

PDF

38.6 KB Created: 2020-08-31 01:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03cedb7dc33ac2c17d0428cc03c9442c SHA-1: 33cc30aab085b687792b74b2813ff2aa1edf4d6b SHA-256: 84c876c2b861375f0f8f5b758a06f8eccd7be0a6a7abee6b817ff9537937c4b0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify domains hosting seemingly benign files, but one critical link directs to a known malicious redirector at `https://ttraff.ru/wix?keyword=lil+durk+bora+bora+video`. This suggests a phishing or scam attempt designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=lil+durk+bora+bora+video
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/ak_name_image_love.pdf
    • https://cdn.shopify.com/s/files/1/0432/7086/5052/files/46073855998.pdf
    • https://cdn.shopify.com/s/files/1/0462/0333/8902/files/busy_busy_song_mp4_pagalworld._com.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/nezemetulapowagaxepirowof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24501063531.pdf
    • https://cdn.shopify.com/s/files/1/0461/7266/8057/files/walmart_financial_report_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/fobubugafikore.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/chennai_city_gangsta_video_song_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/72952552061.pdf
    • https://cdn.shopify.com/s/files/1/0431/9330/3204/files/70447536018.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/3298326147.pdf
    • https://static.usrfiles.com/ugd/b8c837_59faa54f4929421b8ef1af17bd4c860f.pdf
    • https://static.usrfiles.com/ugd/ade4e6_9672cd82cfa7428a896633c1c1712f52.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_off0000452b.bin
c27e02808851d9bedea21736b75adb7fec1ca9f2b852bfb0cd46caa365a82a14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x452B 4844 bytes
font_01_sfnt_off000055b0.bin
2fc88510358d67c0d7ed43cd61d9da211ac21ff30dd217c49d46be61fa7d6b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55B0 10100 bytes
font_02_sfnt_off00007884.bin
676c0883841b43d00b7ee9e48740bba0cd0e68334271d7a078f050a57dd23d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7884 16060 bytes

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