Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e8eb4824ccd155…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 01:32:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d892cad1fbde30631d301f4212320072 SHA-1: b144c01616a996783b64e105425ce0b6957998eb SHA-256: 22e8eb4824ccd155ec153a38d4a9940779153a441975307b9b4997f750488028
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links that redirect to malicious infrastructure, masquerading as game hacks and generators. The document body and heuristics indicate a lure to download or access potentially harmful content. The presence of multiple redirector links and a high ML score strongly suggest 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/479516143/free-minecraft-account-reddit-game-hack In PDF document text
    • http://razredna-nastava.net/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/hacks-for-twisted-paintball-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/best-free-roblox-excuter-thats-safe_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-leaderboards-on-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/como-descargar-local-player-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/tiktok-free-wallpapers_GM835599320.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-cards-link_GM406889139.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_off00002ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED3 23164 bytes
SHA-256: 53758bbb0ea90332353421fd30748412050e4910dc56f761b748cd0f74a6590a
font_01_sfnt_off0000629d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629D 18312 bytes
SHA-256: 8dbef7c4e74fa4cb7ddd765f7d4b87c2be805150d274016986a9d28ec8854e1b

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