Malicious PDF — malware analysis report

Static analysis result for SHA-256 98af05705ea33990…

MALICIOUS

PDF

42.8 KB Created: 2021-05-16 23:46:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d0873fdccb4ec078bf475668bcb1f9fe SHA-1: 33bbd619d5752a65a253c1261c29253955bfa34a SHA-256: 98af05705ea339901a758fb3dd47e9212d98b5c2981eb2c290b77778f999decf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, disguised as game hack generators, which is a common lure for phishing or malware distribution. The document body and heuristics indicate a clear intent to redirect users to potentially harmful content. No scripts were extracted, but the embedded links are the primary threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-to-change-your-username-on-roblox-for-free-2021-game-hack In PDF document text
    • http://apostolosandreaslemesou.com/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-free-master_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/coin-master-free-spins-promo-code_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
stream_003_off000046b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46B8 24796 bytes
SHA-256: e89c70e41d90a4ca7a2081b5dd81cd4ae349e30d65b43251ae32738695fdafc9
font_01_sfnt_off0000802c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x802C 19944 bytes
SHA-256: d2d351a2bb3d9cdd89a343a2df83fee6a5e97dfcbb0487b5d11b0c8b9fdf99d5

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