Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80f430ebbfa7624…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 09:30:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1469c845cb38b9fdff3721487cab7456 SHA-1: 11f187596d8797404f72173e8d5784ded431f64f SHA-256: b80f430ebbfa76243ccbe10637d26c0c459dab3729ff051bd33c731f2d01e11e
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising free in-game currency generators and hacks. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick the user into navigating to a malicious site, likely for credential harvesting or further malware delivery.

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/431946152/robux-free-gift-card-org-hack-game-hack In PDF document text
    • https://yowchang.com/image/data/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-link-app_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/hack-coin-master-apk-download_GM406889139.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_off000049b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B7 24288 bytes
SHA-256: e24d29ec7c2fd9e08ea91030f7e4a4fece038fe94900ab298977b8749b5ec227
font_01_sfnt_off0000813b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x813B 19096 bytes
SHA-256: bb2bfd1b5c80cb1744cd57562806e4410c1e72fb9e1ed3dff7cfd9b3dcead9ac

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