PDF malware analysis — malicious · fc437bace4e5660f

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 19:26:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23

MD5: 48971e1084f15f43b9a26d709b899fd9 SHA-1: f83750168fac5736898470d87ff5926e538577b4 SHA-256: fc437bace4e5660ff0d4fdae605582e281b38d5b6934ec79563defe3ffafb8b0

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious domain, masquerading as a generator for free game currency or hacks. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it's a redirector lure. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.tw/app/431946152/free-robux-only-username-game-hack In PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/free-robux-giveaway-no-hacks-2021_GM431946152.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/roblox-no-login-free-play_GM431946152.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/is-the-game-robux-hacked_GM431946152.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/roblox-imagine_GM431946152.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/pastbin-robux-hacks-for-free_GM431946152.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/free-tiktok-hearts_GM835599320.pdfIn PDF document text
- https://www.markettraderacademy.com/uploaded_files/userfiles/files/roblox-login-page-free_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_off00003281.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3281	22476 bytes
SHA-256: `d0f4bbe6dc4aae5426cbc817fa126bcc8c348e86eadda7842dca37160efd640a`
`font_01_sfnt_off0000646c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x646C	19228 bytes
SHA-256: `6dddefc2d48c7f37f50c1a6b710d30cd99cee34b64e744400aeeb56817a3b712`

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