PDF malware analysis — malicious · 4177e3bb5ec62cf9

MALICIOUS

PDF

97.1 KB Created: 2021-06-09 09:54:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 236a98a9bf19e286141e02f757fc0cb8 SHA-1: f1ff5b5a6a7bb3fb89800030e12e897daa368595 SHA-256: 4177e3bb5ec62cf984892780df13a0a6971807b3a339f451154bc506f96e9fca

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also embeds a large number of external links, many of which appear to be SEO-optimized for game-related cheats and freebies. The presence of a secondary embedded PDF with similar suspicious findings further indicates malicious intent. The primary goal appears to be directing users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9406

Heuristics 7

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.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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 https://netcdn.tw/app/431946152/free-draw-2-roblox-game-hack PDF link annotation
- https://digilib.stieama.ac.id/repository/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/roblox-lumber-tycoon-2-money-hack-script_GM431946152.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/lots-of-robux_GM431946152.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/roblox-tix-factory-for-free_GM431946152.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/toolbox-mod_GM479516143.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/hack-dragon-ball-rage-roblox-mobil_GM431946152.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/tiktok-free-100-views_GM835599320.pdfIn PDF document text
- https://digilib.stieama.ac.id/repository/guuud-info-robux-hack_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00005425.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5425	26048 bytes
SHA-256: `43f048c58978e6c495eabb85b0e48e7f1b4d7f9fc97f127b953fe5b363566bd3`
`font_01_sfnt_off00009180.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9180	3556 bytes
SHA-256: `79c2cb2bc39deec8996b1024c1baee3b666d98096f9ae8de8ad8d78205c9d9db`
`font_02_sfnt_off00009d3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9D3B	18632 bytes
SHA-256: `1948321e46036ef7a86fce7363c42741d482fdecd1af70e946b235d8b00c49b1`
`polyglot_child_pdf_off0000beb0.pdf`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xBEB0	50579 bytes
SHA-256: `6159b747c6ecbd2d3e358f73828cca9d0c4a17a95bf47bb2f0f8a615e160d3e1`

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