Malicious PDF — malware analysis report

Static analysis result for SHA-256 798a5819529137fb…

MALICIOUS

PDF

42.1 KB Created: 2021-05-20 04:05:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: aa5e1b2922bd9d61512d5d5d948bb9f6 SHA-1: 8df0858e54402dab58cdfe42add3a86162a01a05 SHA-256: 798a5819529137fb8a69320e0283c36cb70386d277dda4261eec50b9af8b9153
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free spins" for popular games. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-free-spins-today-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive users to potentially malicious content or downloads.

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/coin-master-free-spins-today-game-hack In PDF document text
    • http://fobh.net/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/pubg-20210-uc-price_GM1330123889.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/get-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/pubg-uc-free-generator_GM1330123889.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-minecraft-coins-for-free_GM479516143.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_off00004a12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A12 24704 bytes
SHA-256: d91e8893b2290b0b4e861faa98dc4118857a2e9216f910f2fadb7ce1b6ac2ea3
font_01_sfnt_off0000821b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821B 18240 bytes
SHA-256: a96ac7afd25cadbabafd1b9dbf0a180d0c1833ed2d07acb4363f122556c39d20

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