Malicious PDF — malware analysis report

Static analysis result for SHA-256 f371c3bd525e171d…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 22:14:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b82bedc16b94f745bc401e6cce8835db SHA-1: 415fcbefb58dd66c002f0ba573289ac16e3c1155 SHA-256: f371c3bd525e171dda22b26ccf9751a887650d079db7e71de0f6d2cd55d70e40
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free items, a common tactic for phishing or malware distribution. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to solicit sensitive information like private keys or passwords. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest a high likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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
  • 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/coin-master-twitter-game-hack In PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-g_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-survey_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_off0000520c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520C 25132 bytes
SHA-256: 6e9174ecf3118f5a4fc4587650333ce18b51ed5152ef50cfb17b315ce101fd11
font_01_sfnt_off00008bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB5 17712 bytes
SHA-256: 338c422cc4b1338db2b603d539e5d6b05580e47693df7a8745f822589ab7623f

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