Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cfeaf7e9a84770…

MALICIOUS

PDF

33.5 KB Created: 2021-07-10 00:24:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 941374e13c0dd9f307c2e80579876414 SHA-1: f761cdee5cbc4e20b77450553d9af728701c0353 SHA-256: a3cfeaf7e9a84770dbcf31988d33c8e4c27117b0cf0d65ca8a64af4692601f4c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.tw', which is identified as a malicious redirector. The document body and extracted URLs suggest a lure related to game hacks and free in-game currency, aiming to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or redirection attempt.

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/479516143/minecraft-dungeons-free-game-hack In PDF document text
    • http://sd-olimp.hr/files/roblox-jailbreak-money-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-robux-with-proof_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/comment-hacker-et-avoir-des-robux-gratuitement_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-roblox-gift-cards-april-2021_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/roblox-guest-shirt-free_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-roblox-gift-card-codes-no-survey_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-hack-into-a-roblox-account-on-ipad_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-daily-free-spins-and-coins-link_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
font_00_sfnt_off00002f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2E 22080 bytes
SHA-256: c178b4e00da9258086e6e7b4fe54a7a466ed9102ce121c576263dace12cfb46f
font_01_sfnt_off00006002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6002 18304 bytes
SHA-256: f6a577bc3f56294164eedaca4aa626844c61f0adb940d643d6f78e4abd993284

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