Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbc7d93b17f12dc…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 23:40:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6e544bfdde19833f46f3e41e7c26f1bd SHA-1: 38da955b122867cbe2b8a62e238e401d3a94c7d9 SHA-256: 8fbc7d93b17f12dca650248c002a1fdca25abc8a04fcd536628df30525494fd2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating malicious redirector links and a lure for game hacks. The document body explicitly contains a URL pointing to a 'free coin master generator game hack', which is also listed as a critical finding. This suggests the primary goal is to redirect users to potentially malicious websites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • 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.
  • 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/406889139/free-coin-master-generator-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-card-collection-in-coin-master_GM406889139.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/what-is-tiktok-make-your-day_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pokemon-go-free-to-play_GM1094591345.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pokemon-go-free-pokecoins-xyz_GM1094591345.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-rape-hack_GM431946152.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/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spin-link-coin-master-today_GM406889139.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_off000051f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F0 25272 bytes
SHA-256: 72ca4bc22176f091fbae2cd99d2f4b72b6f3f9901226ee519f681d020ea5657f
font_01_sfnt_off00008c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C61 2924 bytes
SHA-256: 6e09a5d1c64d460ceb4e2be3d9e2b7c287b85a769777e178a0390ea781e7043c
font_02_sfnt_off00009675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9675 17712 bytes
SHA-256: 257a612313d270105d122f3198241e5dbbd2f563e6a420601a0e3220659a58bd

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