PDF malware analysis — malicious · cbfb9becb01a1bbc

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 00:40:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26

MD5: db1df0fd86a97c8a435c06b4461ff3dd SHA-1: ba813b6bc9e0821cb86da029c9ed079544e03d5b SHA-256: cbfb9becb01a1bbc829ec6c4eff9f44dd6643fa7c57443a502f1ed2eda89edda

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'http://netcdn.tw/app/431946152/strucid-aimbot-game-hack'. This URL is presented as a lure for game hacks, aligning with common phishing tactics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the document's structure and embedded URLs suggest an attempt to redirect 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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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/strucid-aimbot-game-hack In PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/btool-hacks-roblox_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/acop-roblox-hack_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/is-free-robux-real_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/roblox-how-to-hack-gears-online-rpg-using-cheats-engine_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/roblox-gang_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/infinite-jump-roblox-jump-hack_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-n-roblox_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-with-winrar-pc_GM431946152.pdfIn PDF document text
- https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-minecraft-worlds_GM479516143.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.

Filename	Kind	Source	Size
`stream_002_off00002f7b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2F7B	22528 bytes
SHA-256: `5ec52d9955705d2e0be71a48586c8158aca902605baf9bb62dcfb81e9599a3a7`
`font_01_sfnt_off000061ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61AC	19000 bytes
SHA-256: `7aa7d3638efe39ce201bced34717b630daade6b493ca12c61c93c4a944a6a2d2`

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