PDF malware analysis — malicious · 1e1c36f304b82db6

MALICIOUS

PDF

43.0 KB Created: 2021-05-13 07:42:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 464783e822cadf61c5fdd1f4960cff82 SHA-1: 2fb13936a82cbeedae6c9d890e46e719ec3f85bc SHA-256: 1e1c36f304b82db60237c1a1e0eb6958a6783810fdf15dee839f405078d39d55

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple critical heuristic firings indicating it links to malicious redirector infrastructure, specifically promoting a 'free coin and spin' generator for Coin Master. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings. The presence of a 'secret recovery lure' suggests a potential attempt to phish for sensitive information.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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.
Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE

Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
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.xyz/app/406889139/free-coin-and-spin-in-coin-master-game-hack In PDF document text
- https://www.bridalguide.com/sites/default/files/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/fast-robux-online_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-free-link_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/vip-roblox-free_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/robux-hack-tools_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/free-games-like-coin-master_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/roblox-free-robux-website_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
`stream_003_off00004b9a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4B9A	25832 bytes
SHA-256: `20065508061fbda4d04abb9ab0fe230b9c26f63ea1c462c6d36925cdd36b7fd7`
`font_01_sfnt_off000086b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x86B7	18060 bytes
SHA-256: `e7e0a884e59d6d4457fb90cba238d6b772cb21bcfadc79e96e95c97f919ce424`

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