Malicious PDF — malware analysis report

Static analysis result for SHA-256 897b94bfe7bf63a0…

MALICIOUS

PDF

49.0 KB Created: 2021-06-03 13:13:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ecf76ba85b0148bae1cc6406b1c6fb76 SHA-1: 8e4a3870d701ba4a6ff1f2a0d10e04281d8ec7c3 SHA-256: 897b94bfe7bf63a066d8c2944765fd0af1e050cb3b9b07a248eb402e98f2a6f3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'game hacks' and 'free spins' which are common lures for scams. The presence of a visual download button further supports the deceptive nature of the document. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/406889139/play-coin-master-game-hack In PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-a_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/claim-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_off00005225.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5225 28760 bytes
SHA-256: 852012727c70c063b2e928e163905f50d980138e24dbbafc8e16c3f1972c12c4
font_01_sfnt_off00009450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9450 2812 bytes
SHA-256: 869414959d7b492e0f799b560e1731e3ab498bd286c28e9f0d2ec33d9b6cf53d
font_02_sfnt_off00009dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DEE 17956 bytes
SHA-256: 3643e479f0c37cbf16fafc1a8fc3121dcb1ff233e4f2886a877cfbec5145750a

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