Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb01699f5856709…

MALICIOUS

PDF

41.9 KB Created: 2021-05-12 12:04:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bfb1032ebaa47df2408f30d58e65b5f1 SHA-1: f1b377b2f9e07c9a02ac189ea0a2efbea73adcd9 SHA-256: 4bb01699f5856709f22b8ad45e6ba5920dc9eac16e29a84bbf60870f2ecbb9b2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free spins' and 'hacks' for games like Coin Master. The heuristic firings indicate that these links are associated with malicious redirectors and lures for game-related scams. While no scripts were extracted, the embedded URLs and the nature of the lures suggest an attempt to trick users into visiting potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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.xyz/app/406889139/coin-master-free-spins-2021-game-hack In PDF document text
    • https://www.harfa.hr/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/roblox-ftw_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/mcpe-116_GM479516143.pdfIn PDF document text
    • https://www.harfa.hr/files/free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/free-robux-without-verification-or-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_003_off00004908.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4908 24956 bytes
SHA-256: 97cf1ae074135751e433cc55c731ffd9a2ebf21deccb50807a6a02090ffa3612
font_01_sfnt_off0000814a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x814A 18288 bytes
SHA-256: 9f7609fba99e53c6baa99bb04d1c7e3f9b7167131c1520eb2a413cdab4a14871

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