Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b09304e81aeb5b8…

MALICIOUS

PDF

45.3 KB Created: 2021-06-11 06:59:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a008126f604ea34e5eac5cffa38aae3b SHA-1: 356a2130f0f78075f0fa78601a6391ec42fbd238 SHA-256: 7b09304e81aeb5b81409bb64329e6fb57dc62edb386ad5b303bf134a48898bc2
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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/boku-no-roblox-remastered-hack-script-pastebin-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
  • 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 https://netcdn.tw/app/431946152/boku-no-roblox-remastered-hack-script-pastebin-game-hack PDF link annotation
    • http://www.homesweethome.pl/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/cheat-codes-vehicle-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/pokemon-go-free-kr-hack_GM1094591345.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-games-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://www.homesweethome.pl/images/robux-converter_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_off0000506b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x506B 25844 bytes
SHA-256: 3178ec7f68462987f93ff0253ef81d17b16a70eb11bfccb3f349db09afba50fe
font_01_sfnt_off00008b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4F 19308 bytes
SHA-256: 96813d25330b099a9d15a5e42a3e132a3b463562271d64a1db2f279d0b440902

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