Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d70f68efdea91ed…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 15:55:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d2c8fa6fbb2038aa45bf4019c05a66a1 SHA-1: 36c9ba314cc6bf0f8921867bdb7de34e5facb93a SHA-256: 6d70f68efdea91ed7193cd064c85ff508f22e8aee36aaa1d46993d1a7105856f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious redirector. The document body and embedded URLs reinforce this by advertising 'free spins' and 'game hacks', aiming to trick users into visiting the malicious URL. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-2021-free-spins-link-2021-game-hack In PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/pokemon-go-free-dragonite_GM1094591345.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-arcane-adventures-cheat-engine-windows-10_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-game-download-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/the-underground-war-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/bruteforcing-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spin-daily-link_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_002_off0000300f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x300F 23556 bytes
SHA-256: eefac4ee63cc607df330c7227ff322056df4e4d5d3c4d8d1ef5b5d2ab9999cb0
font_01_sfnt_off00006587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6587 18748 bytes
SHA-256: e86d1d7b2a315a4589de0526ea833c85a652b2f2cf198d952b17ceb10db4042d

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