Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8733f4ff2045abe…

MALICIOUS

PDF

53.1 KB Created: 2021-06-11 02:36:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fb6b2bbc7f2fa3a4fe6fa44187929a5c SHA-1: c8b470d7f22bbfb85eeaf1d4c25c539912e8fdcf SHA-256: f8733f4ff2045abe221bcf334becfaf367eb4b8b6fd2898310a9c18b6f26d9b4
240 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a fake CAPTCHA lure. The document body and embedded URLs suggest a phishing attempt disguised as a 'game hack' or 'free generator' to trick users into clicking malicious links. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-get-a-private-server-on-roblox-for-free-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-get-a-private-server-on-roblox-for-free-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/how-to-get-a-private-server-on-roblox-for-free-game-hack In PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/ben-10-universal-showdown-cheats-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-speed-hack-in-legendary-football-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-deathrun-cheats-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005568.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5568 26252 bytes
SHA-256: 4a9ad5e4d2d587af8788ca93a33127ac963ee3d4c3e17b7b2868981982c480df
font_01_sfnt_off00009351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9351 7420 bytes
SHA-256: 0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24
font_02_sfnt_off0000abc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC1 18832 bytes
SHA-256: cac0ddca1d58167cc841f0f3648cf2f4249e7f81855c00bd972fb1cf7881d1f5

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