Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38222bb879b39c7…

MALICIOUS

PDF

44.5 KB Created: 2021-05-12 00:33:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8c09645213188761f1cfd6b049c38208 SHA-1: 82c28a7e498b7c63a98c2175fe276ee6fc57736a SHA-256: b38222bb879b39c76ba3d2a4559bf01ca0b68c550a8f5a368f590c9ff5ff1290
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically advertising game hacks and free currency generators. The document body, though heavily obfuscated, contains references to 'Robux Hack 2021' and a URL that aligns with the heuristic findings. The presence of embedded URLs and the nature of the lures strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/431946152/robux-hack-2021-game-hack In PDF document text
    • http://dejipkesbelt.nl/images/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-roebucks_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-spins-coin-master-april-2021_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_off000046c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46C4 24940 bytes
SHA-256: 07eff4fcb54470623659daa90ade4a93f5826aca47cfc91922ab43a6966d28c3
font_01_sfnt_off00008077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8077 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A26 18648 bytes
SHA-256: 960613bb0fa4c19a2503237e067522a4d484b1b5f3e7387dbdf2c2d9282ca05f

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