Malicious PDF — malware analysis report

Static analysis result for SHA-256 214c3797816e2ec0…

MALICIOUS

PDF

45.1 KB Created: 2021-06-08 16:26:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4baaf43ec62b66f2915e041c32f7c1cb SHA-1: 69cabd2c2df12d313fc0d0fe82c3e619b097ed35 SHA-256: 214c3797816e2ec0d84b81e924947eba4c95f42f8e06edc412de919b0a2d8aed
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure related to game hacks and free currency, impersonating Microsoft to trick users into clicking a malicious link. The primary link, https://netcdn.tw/app/431946152/bubbatron11-roblox-hacker-game-hack, is identified as a known malicious redirector. The document's structure and embedded links suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/bubbatron11-roblox-hacker-game-hack.
  • 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.tw/app/431946152/bubbatron11-roblox-hacker-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/ww-roblox-come_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-legendary-football-hack-feb-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-anime-fighting-simulator-free-vip-server_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
stream_004_off00005121.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5121 25656 bytes
SHA-256: 4f92a33c0f2957c3d3b394dcae941a81e37839b953b0bc5e4bdb595f6970c9d5
font_01_sfnt_off00008cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFD 18532 bytes
SHA-256: b089fe80e7cc955a32b137cef09e0be940ba30623eeca18849f0d87aa841b611

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