Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1ef8694a293ae0…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 07:32:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1e8e16212c1836d6884a8c341739d401 SHA-1: d045d4bb671f753865109a2ce64017e3242979cd SHA-256: fb1ef8694a293ae07502263de70c2ea48eaece497e9935afd9e695ad7c001d39
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising 'game hacks' and 'free generators'. The ML classifier also flagged this PDF as malicious. The document body, though partially corrupted, contains URLs that align with the heuristic findings, suggesting a lure to download or access further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/free-printable-roblox-images-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/pokemon-go-free-9-nerf_GM1094591345.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/village-coin_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-unlimited-free-spins_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_004_off000050ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FF 26172 bytes
SHA-256: aa4b0ada8034f5d4839dd17952405a245a6925dd951a2f8ba984ec73f409d5d2
font_01_sfnt_off00008e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E71 19100 bytes
SHA-256: 52df27bb4923834f8c6fcae4232bb166f01d001b7d976c48697583e0b382e25f

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