Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21cd31f112936e8…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 05:04:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fdcb542dd1ad524d8aa4fdced3ae7914 SHA-1: fa3c3c49eaff322bb31ceb40161625c9eda3a51c SHA-256: b21cd31f112936e8079150e48d930da5bf1d6c2aa91de0449d367b6e7941220f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' and 'free generators'. The primary malicious action observed is the redirection to a URL that likely hosts further malicious content or phishing pages. The document body and embedded links strongly suggest a social engineering lure to entice users into clicking through to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/roblox-cheat-codes-game-hack In PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/robux-codes_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/wurst-115_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_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_off000052c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C2 23988 bytes
SHA-256: d9b0f5224c5973f3996a2349297d2428305851ffaa8094373156eeb5ddddc51c
font_01_sfnt_off00008965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8965 18456 bytes
SHA-256: 79411d0a2da13a8acff975e82d989f343be59a98b2b19e39ed5663a4026c58d6

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