Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f970e5937a64ae…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 13:34:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f5081bc49ccbfd74972cac38616dfeb2 SHA-1: f7776bf954fee174fc859ec75a9ebbee4e0cfe3e SHA-256: f4f970e5937a64ae7752935ddeb7b6ea384e1bd951b1ffdd68589ef4881d3993
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/free-spins-coin-master-2021-game-hack. The document body and heuristics indicate a lure for free game hacks or currency, designed to trick users into clicking these links. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-spins-coin-master-2021-game-hack In PDF document text
    • http://www.siahotel.com/userfiles/files/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/roblox-guess-that-character-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-gamepass-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/hack-hoogon123-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/hacker-forums-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-download_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/roblox-hack-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003048.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3048 22476 bytes
SHA-256: d7e19f0d2f3e38f84f5cf7583d952d0bbbc012a2f6ff670abfe2129f23055729
font_01_sfnt_off00006264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6264 18576 bytes
SHA-256: 461056571ca453647e3c969961301e9f27cf934f5ba6ca99c4dfe7c56792b440

Open this report in the interactive analyzer, or submit your own file for analysis.