Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a86b93b0bee5ac…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 05:25:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 75d59da50dadecf330a631549bede2a6 SHA-1: bde6b600136dbd681dc0f4908195317558eba856 SHA-256: a2a86b93b0bee5acbe577843a557185e200aeb8dbcf79fce2854c3f5442749c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting a "hack coin master free spins" lure. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a high likelihood of further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/hack-coin-master-free-spins-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-minecraft-printables_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_off0000507e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507E 24948 bytes
SHA-256: 31b2ebfb74a4ea6fe0632d097f4165917761be66f5c7d5b38b854889d1fda751
font_01_sfnt_off000089d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D4 18056 bytes
SHA-256: f90826bfe2bc71c0265d319a9184b169c06436e7d3915f152a6a7ecd0e51099f

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