Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c81b97e74434e5…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 21:44:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 88e7a03ae6afb5001d7f5423b182c6bf SHA-1: ec2c895204b01316d8f07681ff15d9054f04adee SHA-256: b7c81b97e74434e522d58e5ca2819718dd2791dabecb1a0b080466cd9800d5e9
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links designed as a link farm, with a primary URL pointing to a 'game hack' lure. The document body and heuristics indicate a strong intent to trick users into clicking these links, likely for credential harvesting or to download further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • 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/406889139/coin-master-free-spins-2021-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/pokemon-go-free-play-online-without-downloading_GM1094591345.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-infinite-robux_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_off00004fdf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDF 26436 bytes
SHA-256: 541b85337fedf45a6ab5c20e670f7293ace027c38594f03bdc6453bd8e24c886
font_01_sfnt_off00008cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC2 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9675 18288 bytes
SHA-256: 9f7609fba99e53c6baa99bb04d1c7e3f9b7167131c1520eb2a413cdab4a14871

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