Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ac883b516a5c9e…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 19:20:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 79b1fefd30de7d89748f189c95c693b4 SHA-1: a9105d146a91d9c3a625984f8391f4fd2bf44272 SHA-256: c1ac883b516a5c9e789913a1261be95b02da3385d11f858eca983391bac37b66
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for free game currency and hacks, directing users to a known malicious redirector. The embedded URL `http://netcdn.tw/app/406889139/free-coin-master-credit-game-hack` is associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in gaming cheats to deliver a payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-coin-master-credit-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-build-you-one-boat_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-robux-without-human-verify_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-money-hack-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-in-roblox-prison-life-v20_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-printable-roblox-birthday-card_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/create-a-free-roblox-thumbnail_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacker-song-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-roblox-mad_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-oof-sound-free-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/tiktok-free-images_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/youtube-jailbreak-robux-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-gift-card-for-free_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_002_off00003247.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3247 22928 bytes
SHA-256: 7e5a16ee63354d3ae64d91cde6dea1005f036318ef828e2989cc5c365d1e1eff
font_01_sfnt_off000065b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B6 18172 bytes
SHA-256: 2fc47c4066dd28e3547f22ef08ec611cc49326c2517731f27ce49f34897b6455

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