PDF malware analysis — malicious · a26ed6140bb84ba7

MALICIOUS

PDF

48.7 KB Created: 2021-06-08 10:42:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 61b02d2fcdb26b6bf68d6b4867612730 SHA-1: 35566d37ad444e669a02dd3d8bc8fb51eed9a1a7 SHA-256: a26ed6140bb84ba7636c05bf79d80bdb6eb96c3cae462be590952c7daecf4ac3

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to further malicious content or downloads, aiming to exploit user interest in free in-game currency or items.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/free-robux-cards-i-just-want-them-free-game-hack In PDF document text
- https://www.sarsen.net/uploads/files/files/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/hack-coin-master-1_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-roblox-printables_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/robux-free-online_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000516d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x516D	26764 bytes
SHA-256: `753a1acd68e33799466b8e5542b596d887fce97844236688b9ce3d8dcbe0c56e`
`font_01_sfnt_off00008e90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8E90	2936 bytes
SHA-256: `916b11be10f0ffa1ebd680d716301a4082435ec0602a7356f5ccddc80b512e8a`
`font_02_sfnt_off000098b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x98B6	19312 bytes
SHA-256: `300042f486a20d08d6d9b7db5e14422d85a607a12ad5bb0884b336fb208faad6`

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