Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd95fde7df44199…

MALICIOUS

PDF

49.6 KB Created: 2021-06-03 06:04:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5e7bacedba371e11a3ba3cd1d4660a86 SHA-1: 27a59a4507b932ae571a17d1783330f0c5f1a47d SHA-256: bdd95fde7df44199747cc5f08a3c7a47cd907709a373c5c06cf08794cb2e795d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a lure impersonating Facebook, promising free game currency and spins, directing the user to a malicious URL. This is a common tactic for credential phishing or to initiate a malware download chain. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9751

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.online/app/406889139/free-coins-and-spins-coin-master-2021-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.online/app/406889139/free-coins-and-spins-coin-master-2021-game-hack PDF link annotation
    • http://perpus.wdh.ac.id//repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/fbchampion_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coinmaster-free-cards_GM406889139.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_off00004e99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E99 25288 bytes
SHA-256: 02367bd57400019f98ee9e7796d7fc02715f75b28ca3db674077768a3d4ec1a4
font_01_sfnt_off00008882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8882 3400 bytes
SHA-256: 75c3a8e6f5c68e0746f893c922e57fd7e888a21fb038f9ae3eedb0a197a59e24
font_02_sfnt_off000093a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93A6 18460 bytes
SHA-256: 871f0cb0a27f8e5dd89901f10b004c29658dd5d4ba968b8e0fec3a5b4bbe6c5a
font_03_sfnt_off0000b652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB652 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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