Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a8ad552e35bf04…

MALICIOUS

PDF

46.0 KB Created: 2021-05-17 05:03:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: abc90e1abb71c501ac9dedf2b77bdc38 SHA-1: 43a7194e030b1b108beca50c3b8db86938848c33 SHA-256: d1a8ad552e35bf0427fdad62d8600cc30c2e9396e6cb696e7967291a126c4868
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to websites offering game hacks and free in-game items, a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous malicious redirector links suggests the document is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/406889139/how-to-get-free-shields-on-coin-master-game-hack In PDF document text
    • http://apx-centre.ru/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-roblox_GM431946152.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_off00004a30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A30 25040 bytes
SHA-256: 0568f7f81306c2cfb664f63dc599166ac545880a873355eee0ab061f861a51c8
font_01_sfnt_off000083ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83ED 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00009175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9175 18288 bytes
SHA-256: 9f23db5f7e4aea9ade489dbfee04f76c59a98f319c99e466b9c1fecfdfb20686

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