Malicious PDF — malware analysis report

Static analysis result for SHA-256 74490c5c3cc835a7…

MALICIOUS

PDF

45.9 KB Created: 2021-05-13 07:12:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8a3b9e3cbcf6de211fbaef391880b18d SHA-1: 0f49ac5fedecb1087aea5f7291a3db571f2dc5bc SHA-256: 74490c5c3cc835a7113b8074e79b0f23e993d4d6f577721c4d7f28006b3039b6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common lure of 'free game hacks' to entice users. It contains numerous links to external PDF files hosted on domains associated with SEO poisoning and redirector infrastructure, likely serving as a phishing or malware distribution front. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/406889139/coin-master-ios-hack-download-game-hack In PDF document text
    • http://dejipkesbelt.nl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://dejipkesbelt.nl/images/coin-master-daily-free-spins_GM406889139.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_003_off00004a08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A08 27356 bytes
SHA-256: 8fe7bc56334dadb5b03cb54bbc1c14f7d39c96df07aeddb4892a1152598205fc
font_01_sfnt_off00008700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8700 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000090b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B1 18296 bytes
SHA-256: 3a29b4d49c4689b3fed86d6dd7d7394cd0d46f52f4bf8aca92fb45191e1be305

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