Malicious PDF — malware analysis report

Static analysis result for SHA-256 28db090d8269a06c…

MALICIOUS

PDF

41.8 KB Created: 2021-05-10 16:30:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1e37e6f8e7d1218f24a7929545a5aa16 SHA-1: 4ef16c51cca545781bf04de2b55afe6f7d51c8e0 SHA-256: 28db090d8269a06cc46a2d6fb914a2f728d1b94035c6a57fedd88720ccc20b10
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free game hack' which redirects to malicious infrastructure. The document body and embedded URLs promote this scam, aiming to trick users into clicking malicious links. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/free-coin-master-hack-no-verification-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/robux-today_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/mathep_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-invite-friends-hack_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_003_off00004bc0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC0 23788 bytes
SHA-256: 0525a9e6f90decc3f3acaae94fc8d991fcfc94335b4ad5d08e4dcf39efb80f45
font_01_sfnt_off000081be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 18016 bytes
SHA-256: 22df04c4dacbc852f4ecaf83adb1826ed6293343c5161e377e09b669fc2092ee

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