PDF malware analysis — malicious · a57ff31133c6e1ba

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 16:14:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25

MD5: ff73e29a256caa7a18d234fabc41c78d SHA-1: 499945041aabb8113d0d4d05ec649212fddce930 SHA-256: a57ff31133c6e1bad1262e288df4c1ac370426ef3531dfd5ec968125f44391c1

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as free game generators or hacks. The document body, though heavily obfuscated, contains references to game-related terms and URLs, reinforcing the lure. The presence of numerous links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content or initiate further downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 6

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.
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/479516143/minecraft-free-online-games-game-hack In PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-game-pack-coin-master_GM406889139.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/free-robux-apk_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/robux-robux_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/tiktok-free-view-iphone-video_GM835599320.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-hack-2021-android_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_004_off000053c5.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x53C5	24596 bytes
SHA-256: `1d31cecbc1aba34f94db282b74c1b7cf4ac48fcb1e3c8381c87272ebe10e6fea`
`font_01_sfnt_off00008bd7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8BD7	17900 bytes
SHA-256: `4b77619cba729584a62e96e7fd69b59749ae88ba583596c01091ec51b146d7ca`

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