Malicious PDF — malware analysis report

Static analysis result for SHA-256 670cca2e03fa3266…

MALICIOUS

PDF

55.7 KB Created: 2021-06-03 22:52:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cc22ebdbdf4d850da78cf3b8aa09d1ed SHA-1: 12fec11a4b2cf9f06c0ea62b812b526914030f6e SHA-256: 670cca2e03fa32662ed4c15b36afb55ac247b93f47fd0e02e4c96a3ec01181e6
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 0.9649

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/roblox-free-items-glitch-game-hack PDF link annotation
    • http://digilib.iailm.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/rbx-com_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-com_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/levvvel-coin-master_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_off00005385.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5385 40228 bytes
SHA-256: 38c172a650e8180df8a33a582c6fed182fc94cd3780ecfbbe7e75c3a7cabab25
font_01_sfnt_off0000ad24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD24 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off0000b6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D7 18596 bytes
SHA-256: 4757519c7671ab5617e6eca55c97a41b239b6d75f6392fe64a9742a0da978b36

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