Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b8a4587f953d02…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 11:29:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d0cd0d9dd2c7d716e05deb8976618be3 SHA-1: c05be695d0fdf656b6daecc73fe10e5ffffc973b SHA-256: 50b8a4587f953d02c64416bb5759913af0cc20097189550d9ad4b3e367c214cb
280 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are advertised as 'free generators' or 'hacks' for popular games, which is a common lure for phishing or malware. One critical heuristic specifically identifies a link to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'free coins on Coin Master hack' and a URL that aligns with the heuristic findings. The presence of numerous embedded links suggests a link farm or SEO manipulation tactic to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/how-to-get-free-coins-on-coin-master-hack-game-hack In PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/dailyrobux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/no-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-coin-master-link-2021_GM406889139.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_off00004df2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DF2 25168 bytes
SHA-256: 63530fc220241b911e2c0fcc79f2dd32990ebdbdccf36ebda9f5b37f73e06d94
font_01_sfnt_off0000876e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x876E 18044 bytes
SHA-256: 8c08c70171ded8116d72ec6b9f41602b425c47027f7aa83ef766cc7ef1375634

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