PDF malware analysis — malicious · 2c7cfc94b52eeb88

MALICIOUS

PDF

42.8 KB Created: 2021-05-11 07:07:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: dd6957316ad53b04d2f80a430b6d3e29 SHA-1: dea4219c7d9366dcf61b2450327e205ca50924e5 SHA-256: 2c7cfc94b52eeb88dc6ea9de5ad917932fa2fddc46250a8da6548328106217c9

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

Heuristics 5

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.
PDF links to a 'free generator / game hack' redirector high 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.
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
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.xyz/app/406889139/coin-mster-free-game-hack PDF link annotation
- https://www.stylafik.in/uploaded_files/userfiles/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.stylafik.in/uploaded_files/userfiles/files/coin-master-70-spin-link-today_GM406889139.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_003_off00004c93.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4C93	25776 bytes
SHA-256: `43f9bd9c28bc7bda4b8b9786422f2b63bfcd66d8ed481ad3fcde89526985a95a`
`font_01_sfnt_off0000876c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x876C	17480 bytes
SHA-256: `d64930a1a11667c7ba59a1ff19119331939412660ea1bfb5b81a6ecffa3b3c8f`

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