Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d61357b856fd5f7…

MALICIOUS

PDF

46.7 KB Created: 2021-05-14 10:10:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1a0253f2300e7149f17ee282cd72eba3 SHA-1: 62d7605e9798f3fac59d1df3b33011719420da76 SHA-256: 3d61357b856fd5f707badd6ee39540db3b0914268ca330eede7f06a2e7e45462
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirectors, specifically promoting 'free Robux' or 'game hacks'. The ML classifier also flagged this PDF as malicious. The document body and heuristics indicate a lure to a malicious URL, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/how-can-u-get-free-robux-game-hack In PDF document text
    • http://pianoservice.com.ua/images/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-pe_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-hack-pc-2021_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C72 25188 bytes
SHA-256: 41ed1535e37d53a37c11ccd798f2dd45b1cb9eef4c5e50d789febf93cff5faf0
font_01_sfnt_off00008617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8617 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000092bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92BF 18696 bytes
SHA-256: 6d387a6157482ae5d4424ea2a1b018d5f079fe6dbc45eeb2149446a5bd008250

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