Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c774a9787d9490…

MALICIOUS

PDF

250.0 KB Created: 2021-07-08 18:27:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 37619bfde8aa6ed5c5a8c751d2226182 SHA-1: 1738419436ae7bf938fdd0e9675a594da1bd2ea6 SHA-256: 12c774a9787d9490e41b3eca9e9c5136c6d301c80236d7dc96b8d7b07abccfda
180 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses brand-impersonation credential phishing, a fake-CAPTCHA lure, an MFA/2FA-themed lure and an urgency-based lure. 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 clean score 0.0098

Heuristics 8

  • 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
  • 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: http://netcdn.tw/app/1330123889/pubg-uc-94fbr-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/1330123889/pubg-uc-94fbr-game-hack PDF link annotation
    • http://digilib.iailm.ac.id/repository/comment-avoir-des-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-sk8r-game-kicked-me-for-no-cheating_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-roblox-bot-account-dump_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-troll-script-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/what-happens-if-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/youtube-roblox-how-to-get-a-volt-blike-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-clothes-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-hack-to-get-a-girlfriend-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-mobile-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/hack-buy-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_024_off00037b51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37B51 25928 bytes
SHA-256: 831eba353904b40357323ee8dcdb7b7106815fbc13334f5adb909fe57671ccc7
font_01_sfnt_off0003b863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B863 18516 bytes
SHA-256: bb41ae423eaccea51f088112a09a1384c7079f9f257c5d1fc69f38ffa5c9bfac

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