PDF malware analysis — malicious · eda1f4b232622866

MALICIOUS

PDF

46.3 KB Created: 2021-06-09 14:33:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 7d6ed6fcdcf093781ccdf8fcb68e4844 SHA-1: 6916d8de77bfa24269d5bd6cd312c2f692b77da0 SHA-256: eda1f4b2326228664e68f1d6e610fbf41c46b472701264414bd1e362ff9d8e39

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that lead to websites offering free in-game currency and hacks, indicative of a phishing or scam campaign. The heuristic firings, particularly the PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to Roblox and free game hacks, aligning with the observed URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9748

Heuristics 5

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
External URI info PDF_URI

PDF contains an external URL action
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/roblox-rs-free-game-hack PDF link annotation
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-instant-inspect-element_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-play-roblox-free_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/can-you-get-robux-for-free-on-roblox_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-scam-gui_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/earn-free-robux-for-roblox-without-adblock_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-hack-in-tower-of-hell-roblox_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/i-get-free-robux_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/robux-hack-client-download_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/does-roblox-have-free-sneaks_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/hack-de-roblox-robux-2021_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-2021-july_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-hack-download-prison-life_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021-site-youtubecom_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/hack-web-tools-roblox_GM431946152.pdfIn PDF document text
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/hack-off-roblox_GM431946152.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
`stream_004_off0000516e.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x516E	25448 bytes
SHA-256: `5174a15a7434e3591f2ed13516a147a7ac82073d2fe08665f03c24750ca75174`
`font_01_sfnt_off00008949.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8949	2852 bytes
SHA-256: `e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f`
`font_02_sfnt_off0000930b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x930B	17948 bytes
SHA-256: `063bf0edf8fdbceec82e10c80b6a50feaaae95326e7326c73920c093f12d28ed`

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