Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf92ffb1490d3aa…

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 06:17:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a83990f151ddc7a513e14675f0a911f8 SHA-1: f4e4bc0de3d389caa10f5424ab8995dd7ea033bf SHA-256: 7cf92ffb1490d3aaa1631cb0637e6766f8fac3915d56a72a079a065f1569bb74
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body and embedded links suggest a lure for game-related cheats or currency, aiming to trick users into visiting these malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/how-to-hack-people-on-roblox-game-hack In PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-minecraft-hosting-24-7_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_004_off000054b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54B7 25828 bytes
SHA-256: c7f2d4e6bd5fb9c09d4db1866b5c961ba4afd034978ba8017fc232d536619d8a
font_01_sfnt_off0000910f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x910F 18676 bytes
SHA-256: 9439cdf519c477105af26a237b903c28353edd649090bb99f856962d56c9ecd1

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