Malicious PDF — malware analysis report

Static analysis result for SHA-256 6319f44df6534aaa…

MALICIOUS

PDF

47.3 KB Created: 2021-06-09 15:50:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 364e1af7f3fcebd20e2e4a6d31a7f0ac SHA-1: 41b5e69c3fe8735460dab32078378980a386926d SHA-256: 6319f44df6534aaa1e14614f0b5f15c8f4cdd6355799979d98857142799becbb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body, though partially corrupted, contains similar URLs and text related to game hacks. The embedded URL is known to lead to malicious infrastructure, suggesting an attempt to redirect the user to a site that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/how-to-upload-audio-on-roblox-for-free-game-hack In PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-no-download-app-but-play-for-free_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_004_off00005195.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5195 24596 bytes
SHA-256: 79c0e2aeaf71d2b59fcc31bf6eb7958a6b3a520e8262d4b027b4dbbc29fd7914
font_01_sfnt_off000089ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89EC 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off000093ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93AE 19136 bytes
SHA-256: 2a1b08a96c7991faf056ab7b075a537db0ccdce290a9e6a25bae716c3af275ec