Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f5e37dfd33a40f…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 04:49:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 717347b90224a8cbb4ac5a8b70332faf SHA-1: d2c55c965e00191998a76eca618d2377b0a4e4e8 SHA-256: 81f5e37dfd33a40f7d5bb7d311c37ec66a2971f056c579df15dda3917b521efc
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9769

Heuristics 4

  • 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.
  • 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.online/app/406889139/free-spins-coin-master-without-completing-offers-game-hack PDF link annotation
    • https://library.sman1berau.sch.id/repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-codes-not-used_GM431946152.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_004_off0000515f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x515F 24236 bytes
SHA-256: 160c2315778cfdb2478a010021e10581918dcfc03630ef7ffdca02e74f996e2c
font_01_sfnt_off000088f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F8 2944 bytes
SHA-256: a0301b7f2c576e4a889a11eed4f4f7770c47239120b218cd3fd1d2cb36c2aaf5
font_02_sfnt_off00009320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9320 19012 bytes
SHA-256: 94ec3d6dd7afe22736a4406c77b2a22b2801cceff0f201dfa37f6b15e40fa38c

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