Malicious PDF — malware analysis report

Static analysis result for SHA-256 82859aaa6c1a3ee9…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 13:04:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5a33c4ec7d16bddbeb39f008e34782e3 SHA-1: 98fc30670ea3b5183ab5f748d1fc91bf747cc603 SHA-256: 82859aaa6c1a3ee9959677d87a6d50ee3f1f0e4f331b498b99f81b108df52ff3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' to lure users. The document body, though partially corrupted, contains references to these lures and the malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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/835599320/tiktok-free-wala-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-withdraw_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-robux-no-human-verification_GM431946152.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_off00004e4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E4C 25468 bytes
SHA-256: 12663f367aa8826ed392e52e2a8014bb79dfa52efb55bd152bd18dcffe676d7b
font_01_sfnt_off00008860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8860 17956 bytes
SHA-256: 898cd4fc8992ce22b3c58be963391f4a86278fab071865ff91fd5926642f9aba

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