Malicious PDF — malware analysis report

Static analysis result for SHA-256 360511d0fdeb82ed…

MALICIOUS

PDF

42.6 KB Created: 2021-05-10 17:32:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 010f6a5d640ded5fd4939a0cd9ed94e9 SHA-1: 9254eea87eddf636ae76580c7b1eb23a2060864b SHA-256: 360511d0fdeb82ed24467857489b4063f75dd4b08ba15d480f3db8578dc3982a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'free Robux' and game hacks, directing users to a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other similar-looking PDF lures. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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/free-robux-no-human-verification-or-survey-2021-game-hack In PDF document text
    • http://bibliodetki.ru/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/whats-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-download-minecraft-for-free-on-windows-10_GM479516143.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_off000045d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45D7 25152 bytes
SHA-256: f34ee3220dd92a89ce8aca96439615a9af4f989414ca1d4949a335d547867f55
font_01_sfnt_off00008068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8068 19556 bytes
SHA-256: 08b2a18d96b3566ec838f0e87c4bb916e955b8f8af04b9064418114d078945b8

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