Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a67a30461ba7b3…

MALICIOUS

PDF

46.7 KB Created: 2021-06-13 22:33:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c7b4babeb01c30b4f22fd0fbc3f8f412 SHA-1: 718186d29fefa6d666da02beaee7acf66eff084a SHA-256: f5a67a30461ba7b3697088eca13884ed9a48fd3defd073b255fbfd1d1aa0c22f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. The presence of a fake CAPTCHA and MFA lure suggests an attempt to harvest credentials or trick users into executing further malicious actions. The embedded URLs point to sites offering game exploits and generators, consistent with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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.
  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.co/app/431946152/how-do-you-buy-robux-for-free-game-hack PDF link annotation
    • http://www.6636.com.tw/ad6636/upload/files/pubg-uc-online_GM1330123889.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/is-pokemon-go-free-on-nintendo-switch_GM1094591345.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-tips_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-hacks-2021-epic-minigames_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-guide-to-free-spins-and-rewards_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_003_off00004ac9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC9 25684 bytes
SHA-256: 7844036de721de8cf9165cb91b30553fe3f4d758a00df8308a99fcc247ce8e7c
font_01_sfnt_off000085bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BF 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000092d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D1 18688 bytes
SHA-256: 5f3184d180c61b0abffb0052fc327a857e9ae7845bb55fbe2700efe9b1f1efb9

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