Malicious PDF — malware analysis report

Static analysis result for SHA-256 2994adc26c2d3d90…

MALICIOUS

PDF

45.8 KB Created: 2021-06-08 16:47:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a8e47faacfa0afee138271de1d279245 SHA-1: 8542cfe3b90711f6fcf1e45b023abff4468785cc SHA-256: 2994adc26c2d3d90d155f28f34ba1df3b703f5fafad61f04a2edd3a1fc167407
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs a fake CAPTCHA and a download lure to trick users into clicking a link. This link leads to a malicious redirector infrastructure that ultimately serves a game hack, indicating a social engineering attack. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-hack-download-for-games-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/freecoins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/best-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • https://collectrobuxIn 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_off0000509b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509B 27264 bytes
SHA-256: 9a4fcdc1c8cf6f2ab3563220cf5634cb5accae49c24988b1c2682348eb6443e4
font_01_sfnt_off00008ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDC 19112 bytes
SHA-256: a33fa059e6179122eae5ed5bafcd3dcaad1145346618d9221b24f7371fb14e1d

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