Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c9f330cf304e84…

MALICIOUS

PDF

34.7 KB Created: 2021-07-01 18:56:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a4db1f2cab6ffa48e103bef2cb030bdb SHA-1: 17d164d1f8bf35e90f18a6ecf1e04b0ac9bef51c SHA-256: 13c9f330cf304e843a9c7d941282146acb611ca62131c4d9242a30b84a6c0a81
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as legitimate resources for game hacks and free currency. The primary lure is related to 'Roblox' and 'Coin Master' hacks, suggesting a social engineering tactic to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.co/app/431946152/how-to-kick-players-roblox-hack-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-2021-accounts-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-in-asssin-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/da-hood-roblox-free-copy_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-how-to-cheat-the-disconnect-thing_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-300-robux-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/are-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-change-your-username-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/mais-backpack-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-account-roblox-2021_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
font_00_sfnt_off0000307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307A 22236 bytes
SHA-256: 30f9dfca67f5178643f0205e9152f702cb3882d0d4ce161f4246b88a8e74b1e1
font_01_sfnt_off000061cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CF 19276 bytes
SHA-256: b9f0cc1c353ce0f9c1421380818f6bcd5554595257cafdbf777c75891a4a291c

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