Malicious PDF — malware analysis report

Static analysis result for SHA-256 855cf786184738b1…

MALICIOUS

PDF

33.9 KB Created: 2021-06-26 12:47:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 55bb9905bad9b1f1a6aaa31972c9481f SHA-1: fd1abe0365dc59bc3724bf71bcba502220ae10ed SHA-256: 855cf786184738b1831ff60506314eed65c7acd1665b1f1bfb9fe8fa1b3a4547
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which are hosted on `www.sovtigaz.ru` and appear to be part of a link farm designed to attract users searching for game hacks and cheats. The primary lure is for Roblox and Coin Master related cheats. The document also contains a direct link to `netcdn.co` which is also related to game hacks. The ML classifier strongly indicated maliciousness, and the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.co/app/431946152/cheat-code-sight-on-roblox-game-hack PDF link annotation
    • http://www.sovtigaz.ru/f/files/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-noclip-hack-download-ipad_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-hack-scripts-lua_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/hacks-da-hood-roblox_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/robux-hack-no-fake_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E7B 22068 bytes
SHA-256: e8dace167c0eca5d497d64abed9856e6d2d609be9d184aea49295d70be6fda1e
font_01_sfnt_off00005f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7B 19048 bytes
SHA-256: 92ffb0f2afd41d50be493b558221d99d85f055bbb89894ffe5a390680aaf4d56