Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c80f97da97defb…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 02:07:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 75a72e5f4cb8269b0f9219fa18a704ab SHA-1: 1acac9496393015c43aafe39a882c38d050d1d8c SHA-256: 59c80f97da97defb5b47fc72e8bb30867bc07b4146ae7a2d0228c9819a92b2b2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

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 http://netcdn.tw/app/479516143/free-minecraft-account-and-password-generator-game-hack PDF link annotation
    • https://perpus.upp.ac.id/digilib/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-speed-hacks-that-u-can-type-in-chat_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-3-easy-steps_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-hide-and-seek-cheats_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-aerial-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/is-there-a-way-to-get-free-bc-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/info-de-jon-fue-el-hacker-de-roblox_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
font_00_sfnt_off000030a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A7 22036 bytes
SHA-256: 13361905bbc56cd6309be006578fec5ef1e31d6da7128e180a356a7b92f992f8
font_01_sfnt_off00006150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6150 18628 bytes
SHA-256: de06f09722a9c42f09fb0709cd7344bbebd04adb34a3467d8ebdf209ae6f7142

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