Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a276bdac0262435…

MALICIOUS

PDF

35.1 KB Created: 2021-07-07 09:50:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d28ce57b981f09c0bfd2938d93aa84f7 SHA-1: d993e6ee6a12759d4b77ff8b1d6795a28a72adc2 SHA-256: 9a276bdac02624353f4972513d8f45257fd159bf28569dcff73d759730cdb04a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary link, http://netcdn.tw/app/406889139/free-coin-master-coins-and-spins-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct the user to download further malicious content, likely exploiting common game-related lures.

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.tw/app/406889139/free-coin-master-coins-and-spins-game-hack In PDF document text
    • https://vierabyragazze.com/upload/files/wurst-115_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-robux-hack-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/pokemon-go-free-7km-eggs-august-2021_GM1094591345.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-royale-high-diamond-hacks_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-roblox-jailbreak-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-no-human-verification-no-survey-no-download_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/como-conseguir-roblox-badges-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/freer-tiktok_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003174.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3174 23476 bytes
SHA-256: 977a5608dc3df34f0146dc03e07c318491d18f5e217afa76f18a798ebd79d32f
font_01_sfnt_off00006675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6675 18348 bytes
SHA-256: cc12283f691ecd9c6c4381c5355a15c3235cfa1ea9601b68c1f91d3883d88a7b

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