Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c81e92dae9de8f…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 03:35:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 343ca772dc3676dc33e4a516b2f98ffc SHA-1: c2971726035d145eef9e5f66255874b0013004e4 SHA-256: a5c81e92dae9de8fed965635f9eb22f6b0172b871836835daab13669a1fbbb58
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/835599320/tiktok-free-100-views-game-hack. The document body and heuristics indicate a lure for free game hacks and views, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of malicious links and the lure indicate a high likelihood of a phishing attack.

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/835599320/tiktok-free-100-views-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/pokemon-go-free-download-apk_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-2021-march_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/medikit-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/fast-car-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-2021-on-ipad-ios_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-roblox-block-piece_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-code-for-call-of-duty-ww2-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-with-commands-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-games-that-actually-work_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
font_00_sfnt_off00003059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3059 22036 bytes
SHA-256: 3196f67a45333f3e5fb29de07a941979f48f18aae7675d246f1128749d6ecbcb
font_01_sfnt_off00006146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 18548 bytes
SHA-256: 2219c16d29f69ce0081967ceb41d8e776e959a05ff936e249670757b1ff8cc25

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