PDF malware analysis — malicious · a09eddfd7cf0b571

MALICIOUS

PDF

42.6 KB Created: 2021-05-15 23:32:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: f42feb5d92b2d88353ea9f43a319c32d SHA-1: 6a7edf807baf8e5695b4a3fe2ad55c5053728549 SHA-256: a09eddfd7cf0b571d2a16eea2ead967593f4b35e4b40a042cee2b189819a24b3

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which appear to be SEO-optimized for gaming-related keywords. The primary URL points to a site offering 'robux for free game hack', suggesting a lure for potentially unwanted or malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of URIs, which are leveraged here to create a link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

Heuristics 4

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.
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.xyz/app/431946152/can-i-get-robux-for-free-game-hack PDF link annotation
- http://bibliodetki.ru/images/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
- http://bibliodetki.ru/images/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
- http://bibliodetki.ru/images/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
- http://bibliodetki.ru/images/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
- http://bibliodetki.ru/images/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
- http://bibliodetki.ru/images/roblox-heroes-online_GM431946152.pdfIn PDF document text
- http://bibliodetki.ru/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
- http://bibliodetki.ru/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- http://bibliodetki.ru/images/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
- http://bibliodetki.ru/images/moonactive-coin-master-free-spins_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_003_off00004a30.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A30	25000 bytes
SHA-256: `aef4a7d36dc234c0924747c4383f7790f0fd3cf9759ab8c1d09e8ed60076bca7`
`font_01_sfnt_off000083f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83F0	18344 bytes
SHA-256: `56a64ad9af2fab004080c55c49ec35472f3c2134e95e40197be892b268dd39d5`

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