Malicious PDF — malware analysis report

Static analysis result for SHA-256 187489bf0b1d24b4…

MALICIOUS

PDF

46.0 KB Created: 2021-05-10 18:03:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 52df39e2ed952baa12d1c9bc1403b07a SHA-1: 1e14bc4d9d6ee63f5b5db7514f86866ab6e6c396 SHA-256: 187489bf0b1d24b43e25389f242a0d62a731be8b904a1d57101e60b1fd84937f
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The document body, though heavily obfuscated, contains references to game hacks and a primary URL that aligns with the heuristic findings. The presence of embedded links and the nature of the lures suggest an attempt to trick users into visiting malicious sites, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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/free-robux-easy-and-fast-game-hack In PDF document text
    • http://ptts.pl/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/roblox-gang_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/gain-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/claim-roblox_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45D2 28264 bytes
SHA-256: d773b7b3910c611b580afa00fce44e8716621f3a37ecfdf8a75294615365fea8
font_01_sfnt_off00008691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8691 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00009031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9031 18700 bytes
SHA-256: cd82fd057618e61f88de5dcbfbdf8dcaa9884b2739de6fa529a9953be94575dd

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