Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b268d4e7f09ac3f…

MALICIOUS

PDF

47.9 KB Created: 2021-06-04 03:31:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6518df236cc522e393361ba914a73d50 SHA-1: d487f7662b66fea9e1ce0878fdf6d7b9a6053cf4 SHA-256: 5b268d4e7f09ac3f7bffbc5e2504d555cfeea06c5affc2776bd15f5a513c5cc1
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 0.9796

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/431946152/get-me-robux-for-free-game-hack PDF link annotation
    • http://digilib-ppsunisma.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-spin-link-today-2021_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_off00005091.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5091 27668 bytes
SHA-256: f0a862c6130893afd13ebb25c1c4e893d679ceaccf70923f441c45c3f9a7d610
font_01_sfnt_off00008eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB8 2888 bytes
SHA-256: 3336a466fcb64b720a3988844ebe6e938788f23c31f568cd9aeb6f9b1346142d
font_02_sfnt_off0000988a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x988A 18312 bytes
SHA-256: 932e048767bb22e6267a54c454926b1d6572868c8ffb63cd4dd0c91a684054b1

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