Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c8bd023ddd7542…

MALICIOUS

PDF

35.5 KB Created: 2021-06-27 20:27:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0be3038bd3ad21586a57178fb3d5bec2 SHA-1: 1e142728f0f5ff6cedf4842ff137457091aabdd8 SHA-256: a4c8bd023ddd7542c4a15b0dd0b590093092221397c2c5d05be6fefcc8bfcdd6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that point to known malicious redirectors, specifically targeting users interested in game hacks and virtual currency like Robux. The document body and heuristics indicate a lure for free game generators or hacks, which is a common tactic for distributing malware or leading users to phishing sites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-the-floor-is-lava-free-game-hack In PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/earn-robux-now_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/free-robux-earner_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/roblox-muscles-free_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/how-to-get-cheats-in-roblox-jailbreak-yt_GM431946152.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://mtsjeumalaamal.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free-on-your-phone_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
font_00_sfnt_off000033c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C6 22544 bytes
SHA-256: 6d5f8baa018b49ed6beeb323df3d9488cd4ab2ce6d09de4c61963852c3508b3c
font_01_sfnt_off0000665c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665C 18932 bytes
SHA-256: 0fcda537679e4d4c3558cf8ccc168a53af5b867029610e1a536227da02aad8d3

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