Malicious PDF — malware analysis report

Static analysis result for SHA-256 3888f4fff78e2b71…

MALICIOUS

PDF

35.6 KB Created: 2021-07-03 16:55:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 866ad7e182f376740d3d530c0631915f SHA-1: c135265df72c124e24daf1f67f00b1184fd5597d SHA-256: 3888f4fff78e2b715f387e69f2f01c8e1e910d349b8cca14eaec91d4f58a81ac
220 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and free items to entice users to click on malicious links. The document contains numerous links to redirectors and SEO link farms, including http://netcdn.tw/app/431946152/roblox-how-to-get-free-clothes-game-hack, which is identified as a malicious redirector. The presence of a visual download button further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/roblox-how-to-get-free-clothes-game-hack In PDF document text
    • https://de-licht.com/image/data/files/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/roblox-legends-of-speed-hack-pain-exist_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/how-to-hack-roblox-accounts-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/how-to-put-a-hack-in-your-game-roblox_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/roblox-music-id-young-wild-and-free_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/get-free-robux-without-playing-games_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://de-licht.com/image/data/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-roblox-codes-not-used_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-roblox-account-with-free-robux_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-roebucks-no-human-verification_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_off000030c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C3 23588 bytes
SHA-256: c22546b877c04d057edc2870cbfaaa8bca06dcb5fb27288b14c2274bdbb11d63
font_01_sfnt_off00006602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6602 19084 bytes
SHA-256: a791f0495df25e39b7201d0df2057ead19b92065fc7489ee2d58b9e24ed28277

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