Malicious PDF — malware analysis report

Static analysis result for SHA-256 a666bd343edbce23…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 19:10:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 373ed51f1e2438cc32040970f612602b SHA-1: f2003d4e7fd6ea0d1ebb7a2d82d3ef8b3796a557 SHA-256: a666bd343edbce23aaebba08bb8e3391418a2659ac9c823021d4707b916caedc
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, aiming to trick users into visiting compromised websites. The document body, though partially corrupted, contains references to 'Roblox Hack Me' and URLs associated with free generators and game hacks. The presence of numerous links to external PDF files suggests a link farm designed to attract traffic through SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/431946152/roblox-hack-me-game-hack In PDF document text
    • http://stitqi.ac.id/website/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/bexggg-free-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-robux-promo-codes-2021-september_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/www-robux-com_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/websites-that-give-you-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_off000032b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B6 22900 bytes
SHA-256: 13f0f3fee2e3441b29693507c37290ce058886466159e6ad1873e4bd9b91714d
font_01_sfnt_off000065c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C6 18852 bytes
SHA-256: ae5bbd1016d3eca5969145279625dbf0af4bdaae54505d1f649a6545bf5fde29

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