PDF malware analysis — malicious · f663705dea4119e4

MALICIOUS

PDF

35.1 KB Created: 2021-06-29 17:01:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23

MD5: 22a5d439efa50cf2a97066a23c49e308 SHA-1: 346afbd565f7f32b81394c88d8c053cf09e1c01d SHA-256: f663705dea4119e4f70584615bc1975678d74caad900f12b8b1bb24d06eb1539

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.co/app/431946152/free-roblox-party-invitations-game-hack, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely using a social engineering pretext to drive users to potentially malicious content or downloads.

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.co/app/431946152/free-roblox-party-invitations-game-hack In PDF document text
- https://www.wco.org.uk/uploads/files/files/free-2021-robux_GM431946152.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/coin-master-hack-pc_GM406889139.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/lots-of-robux_GM431946152.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/roblox-exe-download-free_GM431946152.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/sex-hack-link-roblox_GM431946152.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/roblox-april-fools-hack-roblox-blog-post_GM431946152.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/free-robux-no-verification-2021-mobile_GM431946152.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/free-robux-no-human-verification-or-survey-2021-on-ios_GM431946152.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/tiktok-free-like-and-followers_GM835599320.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/free-vip-games-on-roblox_GM431946152.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/wurst-download_GM479516143.pdfIn PDF document text
- https://www.wco.org.uk/uploads/files/files/is-john-doe-a-hacker-in-roblox_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_off000030e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30E4	22700 bytes
SHA-256: `ad8ca0517bb4a853c492c401bc15931e94c89efcd00bc1896c0f4800708e1897`
`font_01_sfnt_off0000637b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x637B	19320 bytes
SHA-256: `1178f307af6e955338fa8babadeaefd904345b4a8c2139ca843d092cba6b8594`

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