Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffeb9c31a54776cb…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 19:12:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4a5805cf314b20298c1dbd7b94903128 SHA-1: 148ec0b8b1bd4a3541a896559470f89eb1922746 SHA-256: ffeb9c31a54776cb9da54dd7daf7647499344aa6b5b922337ff5e329c5e5189e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary link, http://netcdn.tw/app/406889139/coin-master-hack-android-2021-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick users into downloading further malicious content, likely through a client-side exploit or a drive-by download facilitated by the redirector.

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/coin-master-hack-android-2021-game-hack In PDF document text
    • http://sellitafrica.com/media/storage/editor/files/cheat-engine-en-roblox_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux-come_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/working-free-robux-hacks_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robloxunlimed-verification-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/1x1x1x1x1-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/e-free-roblox_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/2021-april-fools-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-shelly-bag-in-roblox-booga-booga-free_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-coins-2021_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_002_off0000319c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319C 23516 bytes
SHA-256: 24f746e5eba1d43f294c6497ee46a53d999de6f7b143d5734f49e528a4ba111b
font_01_sfnt_off00006692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6692 18580 bytes
SHA-256: e1eb252879878bc6c6be22e70e77f532303e52474717b0bf3300728c29bf13dd

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