PDF malware analysis — malicious · 8f5079c2cf9ccd1b

MALICIOUS

PDF

33.0 KB Created: 2021-07-06 05:00:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27

MD5: 080a5958031dac72a7882bb6eb7b8e5e SHA-1: e82faabf5da58c7a0b8f8a0c4215c8575dfab32d SHA-256: 8f5079c2cf9ccd1b273a4856ce3c8edf9252d79263d7d34aa0e5b8820aa95eff

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a common lure of free game currency and hacks to entice users. It contains multiple links, including a primary malicious redirector at http://netcdn.tw/app/431946152/where-to-get-free-robux-game-hack, which is designed to lead users to potentially harmful content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9824

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/where-to-get-free-robux-game-hack In PDF document text
- https://vosco.vn/uploads/vosco.vn/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-club-hack_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coinmaster-fan-page_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/roblox-cheat-codes-for-robux-and-tix-2021_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-vip-server-roblox-booga-booga_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-make-roblox-clothes-free_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-roblox-accounts-september-2021_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/expensive-avatar-for-free-roblox_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-robux-no-offers_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.

Filename	Kind	Source	Size
`font_00_sfnt_off00002ac6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2AC6	22052 bytes
SHA-256: `552054dc3a09c776c61ba99f21a30ec7be90e8b104baaa5ea4d9e119b4ed31fc`
`font_01_sfnt_off00005bc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BC7	19184 bytes
SHA-256: `e942b93b228ea09a2b9b89b185e62feaf889c583a2152a741a620a9da1dbb754`

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