Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8890fa9953c120…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 19:22:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4d21fa01761dc930c8397604a15edb95 SHA-1: 0860fa86987543cc1e7545b8cef4bd4cfad6860c SHA-256: 8c8890fa9953c120902bca73faac47d1984b4bfc1527c77a170e23bd314083ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game-related lures, such as 'free generator / game hack' and 'free robux'. The document body, though partially corrupted, contains references to these lures and embedded URLs. The primary function appears to be redirecting users to potentially malicious sites that may host further malware or phishing content.

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/roblox-weird-game-hack In PDF document text
    • http://promotion.si/images/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/free-coin_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/roblox-redeem-card-codes-free_GM431946152.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_off00004914.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4914 25636 bytes
SHA-256: 060ec90dae1f3b44d0104bab71dea389d5812723a58d56d7fda94276234116be
font_01_sfnt_off000084c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C1 18276 bytes
SHA-256: c73f05497238d4ad443a2fb3c2db4789f31edea3a39b5634aeac287d37ee79d6

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