Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f6993fa90a04bd…

MALICIOUS

PDF

46.0 KB Created: 2021-05-12 21:09:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b331827b85ba7c364de4bf446a97efcf SHA-1: 7b269ee72d611af5b01b3120276f380c988ea72f SHA-256: a3f6993fa90a04bd53bcf3e6babb97afab6bd3e726762f061a151619470fb4f7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.xyz/app/431946152/roblox-fun-com-free-robux-game-hack PDF link annotation
    • http://perpustakaan.smkn1pbg.sch.id/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.smkn1pbg.sch.id/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B61 24988 bytes
SHA-256: 84d7735faa0473783deb8486f50421e6316bbaa0dc27211b54b21ac5ae9938aa
font_01_sfnt_off0000843f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x843F 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9150 18348 bytes
SHA-256: 9560f0e6f9a4e6be006083e3696e79311a38bb173f302534750988b281bae61f

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