Malicious PDF — malware analysis report

Static analysis result for SHA-256 6528ab9251ea3612…

MALICIOUS

PDF

43.3 KB Created: 2021-05-12 06:10:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e127246fdab128be0b9a8a2680e7f849 SHA-1: 335b6f9f1b30547293423170b0dabaa4eecb4016 SHA-256: 6528ab9251ea361265cce86535fd3a9f9d0c67fd71338800a7434eaa78cfc87c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The document body, though partially corrupted, contains similar URLs and text suggesting a scam. The ML classifier also flagged the PDF as malicious. The primary attack vector appears to be social engineering via a malicious link embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/free-coins-game-hack In PDF document text
    • http://axiapublishers.com/images/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/free-spins_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://axiapublishers.com/images/moon-active-games_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://axiapublishers.com/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://axiapublishers.com/images/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://axiapublishers.com/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/robux-free-gift-card_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_off00004a1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1C 23620 bytes
SHA-256: 4e6093f5c819a16d7ab46efc96b5afa185327e5ec5f4370e8cadf2f05fc1ba96
font_01_sfnt_off00007fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA7 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8992 17380 bytes
SHA-256: 4587a0da3d318d3aab2e4d3a2e17e88175961c64bd2fb3ac3dbf4933656e475a

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