Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fb712c6420eba0…

MALICIOUS

PDF

47.2 KB Created: 2021-06-04 01:27:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10935438dd9b49c8e012d3b9724c2f4d SHA-1: ab1dddbe36d3eb37c9a9a59685db0ad19d294ca9 SHA-256: 38fb712c6420eba01a8ea6cf19b3801d6490449b12d3a4d9094fbe21c562ff08
142 Risk Score

Malware Insights

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

The PDF contains numerous links to websites offering game hacks and free currency, indicative of a lure for potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of outbound links, likely to SEO-optimized pages designed to attract users searching for cheats or free items. The ML classifier also strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/479516143/how-to-get-minecraft-windows-10-for-free-game-hack PDF link annotation
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/app-that-gets-you-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/grabpoints-robux_GM431946152.pdfIn PDF document text
    • https://www.youtIn 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_off0000520e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520E 24924 bytes
SHA-256: dd09316dac5f70a8dfcc4e183eccec152fdd37345043bf9d3dba39d76657a5e7
font_01_sfnt_off00008af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF7 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000094e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94E1 18524 bytes
SHA-256: 9c72abd8977421c50785b44719a9a0d208cbbe36d089006de9c81bf453dbcd54

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