Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b8ee666afa2df1…

MALICIOUS

PDF

36.3 KB Created: 2021-07-08 15:53:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 11b6d121319acd3187a7d01795177e8b SHA-1: 1b28b622c6e6ff7a0d520ff51d9191036c80be3e SHA-256: 50b8ee666afa2df120d35ebe302bbe3692911950646a6ed18523dcfd745ecb10
142 Risk Score

Malware Insights

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

The PDF document contains multiple external links, including one to 'netcdn.tw' which is flagged as a game hack redirector. The document body and heuristics indicate a lure for game cheats and free currency. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, likely to drive traffic to malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.tw/app/406889139/coin-master-free-coins-link-2021-game-hack PDF link annotation
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/get-free-robux-cheat-engine_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/little-kid-caught-cheating-on-his-roblox-girlfriends_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/is-roblox-hacking-illegal_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://elearning.manurulkhoir.sch.id/__statics/gudangsoal/files/hack-someone-on-roblox-and-steal-their-robux_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_002_off000035dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35DD 23224 bytes
SHA-256: 6f0cb6945ce85375380d08bc5d585f785bfef54214473489590701d5078e3024
font_01_sfnt_off00006a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A39 18568 bytes
SHA-256: 5c6f2b8c8950227f34c0c7c762a0319831c5dcbb819f0110f1dbfe9ff8d1e338

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