Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f350f44337a141…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 22:06:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bbdd3d124efff866c1ce4d53ccccb833 SHA-1: a5484ad2167c40c553aecd60d513ff8a56a4c728 SHA-256: f7f350f44337a1411929630e5b54852d6d903a5eee4eef43f1858c6b29543c29
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, including a critical redirector link to 'netcdn.online', which is associated with game hacks and free currency lures. The document body and heuristics indicate a pattern of linking to external sites, likely to facilitate the download of malicious software or to lead users to scam pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • 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.
  • 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/479516143/minecraft-apk-free-download-016-0-game-hack In PDF document text
    • http://www.js100.com/uploads/ckeditor/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/hack-client_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-do-you-get-free-robux-without-doing-anything_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_off00005450.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5450 25368 bytes
SHA-256: 68041a4288c74e83098bbc45fcae33f0492c33bd60dad525c31d888c2a8f1f93
font_01_sfnt_off00008d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D58 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000970a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x970A 19080 bytes
SHA-256: f13f0d8e664d8a95e4a41956b425f9fe55b0e7914f7d7dfb5e00b4a0dff36d0a

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