Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c6cc13ff260cf5…

MALICIOUS

PDF

42.5 KB Created: 2021-05-17 17:21:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 491295fc25e98239b8cb3a1c852ef2b4 SHA-1: 2ca041d217a155e10bfd2f453abd956b3d24be7c SHA-256: d7c6cc13ff260cf5c237ac18caa7232c88ac431b236cfc815ebf1b9e175f0983
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a known malicious URL. The document body, though partially garbled, also contains references to the malicious URL and mentions 'free generator / game hack', reinforcing the lure. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL is likely intended to download a second-stage payload.

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-links-for-coin-master-game-hack In PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/toolbox-for-mcpe_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_off00004a68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A68 25296 bytes
SHA-256: 22bd27851687e766bb81debfc45c2d5d086120d6e5d5c68413a5378fbfa360e9
font_01_sfnt_off0000850f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850F 17880 bytes
SHA-256: a04fca5b08559e76c7fc5751e50b7e5576d0693cd390b0db561ab022dd525d54

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