Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f5409e65e795be…

MALICIOUS

PDF

47.1 KB Created: 2021-06-08 21:59:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bd401c5f3858ea2890047dc1e8a45cb2 SHA-1: 64dd1ec391d52343adf1f0e08fc6ee8525862377 SHA-256: 53f5409e65e795be913c5b2dbe0b1011e4ed3a7941d9a7f39f0e5b5da2acf6c4
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 0.9769

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.tw/app/431946152/roblox-clothes-girl-free-game-hack PDF link annotation
    • https://www.manmed.info:443/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/promo-codes-for-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-10-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-tiktok-app_GM835599320.pdfIn PDF document text
    • https://www.manmed.info:443/images/eyes-the-horror-game-update-2-alpha-hack-roblox_GM431946152.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_off00005322.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5322 25420 bytes
SHA-256: bd4ec2608522fda211812b4a1b7ca24419a3af09779e03f0de528f6261b31f23
font_01_sfnt_off00008b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B72 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000955c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x955C 18340 bytes
SHA-256: 0ce9fb94685f20615f8f4630379793dd279dd4036a9142c26ce79677e7f523e1

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