Malicious PDF — malware analysis report

Static analysis result for SHA-256 156ddd55a328ebb2…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 04:20:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 06e021334cd2a5206b2bfcd186c107e8 SHA-1: 0abe1e03648dc589f4c6192df2030e253c3e7459 SHA-256: 156ddd55a328ebb21cca4a184b63f8314db843d94d8a0967811ccbad0a4b0b32
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, that promise free in-game currency and hacks. The document body and heuristics indicate a lure for game-related cheats, likely leading users to phishing or malware download sites. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a social engineering attack.

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-coins-and-spins-in-coin-master-game-hack In PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-exploit-kits-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-hack-roblox-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-games-on-roblox-link_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/is-hacking-on-roblox-illegal-in-australia_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-tix-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/hacking-commands-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-no-anti-spam_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-free-shop-gui_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-how-to-activate-hack-gui-script_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-verification_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/robloxfun-com-robux_GM431946152.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_off000032b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B2 22872 bytes
SHA-256: 6825b30c6bd1519d4cce267836c8da68361d9fdfb1e53af0160c19e9c3d787d6
font_01_sfnt_off000065f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 18348 bytes
SHA-256: 3394dff2a2236ff5ebd01f8571ec2988f1167f0416feeddb65e6ed7fa563ded8

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