Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c1562caa2b6567…

MALICIOUS

PDF

52.3 KB Created: 2021-06-03 07:40:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1ecd3d8e243f50bc227be361cd100872 SHA-1: 6d7aa90b89d200d70541ebd8c8f14d9a898e4112 SHA-256: a6c1562caa2b656704b58a9f501317f2c6dc9ec1f14cfb27591a9de5cbbbcfb4
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, disguised as 'free generator' or 'game hack' lures. It also displays a fake CAPTCHA to trick users into interacting with the malicious content. The primary URL associated with these lures is https://netcdn.online/app/431946152/free-robux-without-human-verification-real-game-hack. While no scripts were explicitly extracted, the nature of the lures and the presence of embedded URLs suggest a phishing or scamming attempt, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.
  • 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
  • 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/free-robux-without-human-verification-real-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FC1 28052 bytes
SHA-256: 9925f5af70d60bce37a2f993bfed839827966eff42b1c1a11269601c63b037c3
font_01_sfnt_off00008fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE1 2880 bytes
SHA-256: a2abb16672545dc40f4313872ce9cfa8d16eaf92960bd568423d37121421eaee
font_02_sfnt_off000099c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99C9 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6DA 19296 bytes
SHA-256: fcd37aae12381262441149b3f055c838aea0a99c045645b338d4096dcdd54a9c

Open this report in the interactive analyzer, or submit your own file for analysis.