Malicious PDF — malware analysis report

Static analysis result for SHA-256 2befa358c3cc45ec…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 04:58:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2b4ae138b13bc6a4a2e3c81bbda2b4a8 SHA-1: 4b5ba071b835bab5bca500644f8d6de884a52db2 SHA-256: 2befa358c3cc45ecbfcc4da3079458caa1328465ddc5f927082d366d0bb25c9e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to websites offering 'free generators' or 'game hacks', such as the primary redirector at http://netcdn.tw/app/406889139/coin-master-daily-free-spins-link-game-hack. The document body and heuristics indicate a link farm strategy, directing users to various PDF files hosted on http://www.sovtigaz.ru, likely as part of a phishing or scam campaign. No scripts were extracted, but the embedded URLs and link farm structure are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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
  • 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.tw/app/406889139/coin-master-daily-free-spins-link-game-hack In PDF document text
    • http://www.sovtigaz.ru/f/files/free-robux-for-watching-videos_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-snowman-roblox_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/event-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-pets-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/dantdm-gave-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-cheats-deutsch-pc_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-robux-on-macbook-pro_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/hacker-para-roblox-2021_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_off000032eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32EB 23236 bytes
SHA-256: d55c21efb72f44cbbc3c729d957fe15e719bfc6ac3bbc7bfefa7f5d021f6cc10
font_01_sfnt_off0000674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674C 18768 bytes
SHA-256: 989ac8744b1238afa99b88b7bb3fb2df9d299a986309a52cf516f5921eb03fc0

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