Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d2176de33dcd5a…

MALICIOUS

PDF

42.1 KB Created: 2021-05-13 06:25:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 235de8375e68a6b02302de39b2b9fd78 SHA-1: 0e149c4bbebdbfc3c30c458838b909815850f97a SHA-256: 31d2176de33dcd5a4d9f6bec4ecdad44713127019c5241c9c95afbadcf81116e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body and heuristics suggest a lure for game-related cheats or currency, aiming to trick users into clicking these links. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-spins-in-coin-master-2021-game-hack In PDF document text
    • http://heddalboring.no/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://heddalboring.no/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://heddalboring.no/images/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/ww-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/get-free-robux-2021_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
stream_003_off000049cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49CD 24400 bytes
SHA-256: 4d758ea4a22de44e96ad9c3f55f8345f2dc38e62d67b79e8d2624e32c1348e29
font_01_sfnt_off000081ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81AB 18452 bytes
SHA-256: 614b442f464a30c8e1247073dd83761b8901fda729b002daf0f1775ab60cf60b

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