PDF malware analysis — malicious · 45fa213e4be01e3b

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 08:57:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: dd030eee5bb25628da198c2c55d4c605 SHA-1: 6b9eec7bbc2c61c1a3ab90bd5d8f372e010db26d SHA-256: 45fa213e4be01e3babae71161cf8cb403cd09bb3b180fde89ee01f2ec485136e

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them, promising game hacks and free currency. The primary URL, https://netcdn.online/app/406889139/coin-master-free-coins-generator-game-hack, is identified as a malicious redirector. The document also hosts a link farm of 28 other PDF files, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the structure and embedded links strongly suggest a phishing or redirection campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.online/app/406889139/coin-master-free-coins-generator-game-hack In PDF document text
- https://www.jcn.co.uk/uploads/files/files/actual-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/op-rewards-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-robux-app_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/minecraft-free-download-android_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000528d.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x528D	24780 bytes
SHA-256: `83fb60cda7c9bd7a0415c3ba2915caf8f8b301e63051fac625bd447d8f95f454`
`font_01_sfnt_off00008b93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8B93	3400 bytes
SHA-256: `4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07`
`font_02_sfnt_off000096bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x96BC	17712 bytes
SHA-256: `f6b7bbb27796bfdd91832c5c9631b2ef3c604ec4967bc220e21b541acce31e79`

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