Malicious PDF — malware analysis report

Static analysis result for SHA-256 db88b7d2dc926756…

MALICIOUS

PDF

32.7 KB Created: 2021-07-04 22:53:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 01d3c55d7938fbeb0cdcb2c1ac0bdf7d SHA-1: ec411880507b74cdde2d4042a0fe1343fba9f2c3 SHA-256: db88b7d2dc92675629f1ece040615c617ef5fef8e2c9425229c896102f364228
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.tw', which is flagged as a malicious redirector. The document body explicitly mentions 'How To Get Free Pet Food In Coin Master' and includes a call to action for a 'COIN MASTER GENERATOR', indicating a lure for users seeking in-game advantages. The presence of embedded URLs and the nature of the lures strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/how-to-get-free-pet-food-in-coin-master-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-polyguns-hack-credits_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-admin-logo-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/tiktok-free-to-use_GM835599320.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-play-roblox-rfor-free-no-acount_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-be-a-hacker-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/buy-for-free-roblox-builders-club_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-minecraft-addons_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_001_off00002a29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A29 22568 bytes
SHA-256: 28f2450e516a1bf6b2a5fc6b28afb715abfa456dc4c1565800fdc35dbcc6e4c5
font_01_sfnt_off00005cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAD 18492 bytes
SHA-256: 3b8d0933b66d4a3ba90188940e5d7ed21cf944b8acae8725630a3c3be9b63f2c

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