PDF malware analysis — malicious · 6bdefb3563158f6f

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 16:31:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23

MD5: b51959b76da20af99d7ab2f22443388b SHA-1: 6d2d8ea7d1bd0a367ff14bfc034aa8bb15bd1e46 SHA-256: 6bdefb3563158f6f328cb3cc92fd8d0bdf3b79469176181fc753a26baddbbad3

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising a 'game hack'. The document body, though heavily obfuscated, contains references to 'Coin Master Free Coins' and a URL that aligns with the heuristic findings. This suggests a phishing or scam attempt to lure users to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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-link-blogspot-game-hack In PDF document text
- https://www.andrology.co.uk/uploads/files/files/pokemon-go-best-free-outfits_GM1094591345.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/rbx-free_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-robux-rewards_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/roblox-hack_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/roblox-svg-free_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-links-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/get-robux-today_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/minecraft-clipart-free_GM479516143.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_004_off000053a8.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x53A8	25544 bytes
SHA-256: `71b0f01f59b0d842459e6c021980d13196db34a06e548a23fc67afd66feadc07`
`font_01_sfnt_off00008c18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C18	18632 bytes
SHA-256: `25a48d095538c21b3574d128913f1d88808f27fbb4560e17bb648f934a14342e`

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