Malicious PDF — malware analysis report

Static analysis result for SHA-256 9290c40d18594c0d…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 21:19:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7fbdd8f4c5922cd491aa00add855ae59 SHA-1: 57106d6d7ada490d25cb7c5f7645f1353f94450b SHA-256: 9290c40d18594c0dc3d5a821817055aedc02611512dfcda7407845529b2466f1
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/835599320/tiktok-free-view-iphone-5c-game-hack. This redirector is associated with lures for game hacks and free currency, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and heuristics point to a social engineering attack designed to lead the user to malicious content.

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/835599320/tiktok-free-view-iphone-5c-game-hack In PDF document text
    • http://library.acehresearch.org/repository/free-robux-codes-2021-september_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-fps-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-exploit-dll-namedpipe_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-canada_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/rolox-promocodes-for-robux-no-hack-no-waiting_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/what-are-the-memory-codes-for-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-free-without-sign-in-also-free-robux-no-downloading_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-admin-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/goku-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-unercorn6-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-free-dominus-hat-not-model_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/undetected-cheat-engine-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-tuts_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
font_00_sfnt_off000031c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C7 21136 bytes
SHA-256: fa0bc2fb79e6295504e514f8ee4f30aeaf488eaccaf7afc5df84f63ec963ee14
font_01_sfnt_off00005fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB9 18748 bytes
SHA-256: 74486a951fc6694c48fc5fe050a5682a527a52d5e4ec004eac0e0db1ec1b2f6c

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