Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc706cc5d1e11a3e…

MALICIOUS

PDF

41.2 KB Created: 2021-05-19 11:41:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e780f1d21291a19fc0a0c7a4d4f7f50f SHA-1: 57c87afbeeba0afd495d23b75275a8c29a10287d SHA-256: bc706cc5d1e11a3e8563a13562f234a247e75c04fed2ce008d07cf82d52dbed1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are SEO-optimized PDF files related to game hacks and generators. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, also contains URLs related to game hacks, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-hack-spin-generator-tool-game-hack In PDF document text
    • http://kruiz21.ru/images/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/earn-roblox_GM431946152.pdfIn PDF document text
    • http://kruiz21.ru/images/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://kruiz21.ru/images/moon-active_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/robux-gainer_GM431946152.pdfIn PDF document text
    • http://kruiz21.ru/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://kruiz21.ru/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://kruiz21.ru/images/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://kruiz21.ru/images/fbchampion_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://kruiz21.ru/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://kruiz21.ru/images/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://kruiz21.ru/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://kruiz21.ru/images/coin-master-free-spins-link-today-hack_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
stream_003_off0000482f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x482F 24560 bytes
SHA-256: 60ab7be4171286d73e57b51c47d08046968e345827131f59f07f21c47d9e9913
font_01_sfnt_off00007f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F76 17968 bytes
SHA-256: ea67d54f04c33a937dae932ca1fc44fc221a1b4b4b4a53e5a275faf6159c5a59

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