Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ef9b9290df6cb2…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 05:23:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e8b6ea824ec4b9c4c60a2494bcdc2502 SHA-1: 6423f2d1e4be0a99f271305f74faf65599e5787f SHA-256: 16ef9b9290df6cb2b7af9792d37c1bde0bd41e4f6c79a65e62dc12fa24a04f1e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that are flagged as malicious redirectors, specifically targeting users with lures for game hacks and currency. The document body and heuristic firings confirm the intent to redirect users to potentially harmful sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score indicate a high likelihood of a malicious workflow.

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/431946152/free-robux-mobile-game-hack In PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-hack-filtering-enabled-games-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-shards-shard-seekers-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-cheat-engine-681-scripts_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/red-boy-v2-jailbreak-roblox-hack_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_off00002d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D5D 22192 bytes
SHA-256: abae9ca90ccb2908be99c96a7dfff577ae06d6820e2439f93953100f1f1b77cd
font_01_sfnt_off00005edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 19104 bytes
SHA-256: 573e3addcc1a6fdc5e08f445db2ef54d6c45d37482ab709f67476411b6906f7c

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