Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5f7c5abec1d8b1…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 14:02:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 43ae611da572f6d963767de2e08e4530 SHA-1: 2398ca1c408d20ebd7b01f7942adece00cee402f SHA-256: 9f5f7c5abec1d8b15a57038856195232c20701e0a4514b788f658dbb66907088
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-spin-and-coin-link-today-game-hack, which is designed to trick users into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

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/coin-master-free-spin-and-coin-link-today-game-hack In PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/artmoney-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/roblox-being-hacked_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/boku-no-roblox-quirk-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/free-robux-hack-mobile_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/free-aesthetic-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/how-to-get-roblox-veichle-simulator-hacks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/roblox-bandit-simulator-codes-new-hacker-update_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://perpustakaan.sman2bondowoso.sch.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003254.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3254 22932 bytes
SHA-256: 335f5c3dacff7caed97542d02c476c45f16f88af7e706c7cf4e2d5286c3375b7
font_01_sfnt_off00006600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6600 18696 bytes
SHA-256: a6f9ee4f31e630697269259bd77ba9f20f050f36d84dfdb118abf4b75a264952

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