PDF malware analysis — malicious · f87cfd37b34f9d90

MALICIOUS

PDF

43.0 KB Created: 2020-09-01 08:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a00cacd03427fe19408d306bbe148d3e SHA-1: 80712756b5a28c530f49c678cb5f2a6bc7a5a9e1 SHA-256: f87cfd37b34f9d90f0bea3336df4174e925c9438a66f97fea7608dbec7b1e4ab

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to static.usrfiles.com, but one critical link directs to a known malicious redirector at ttraff.cc. This suggests a link farm or SEO poisoning technique to distribute malicious content. The document body, though heavily obfuscated, contains the target URL, indicating an attempt to lure the user to malicious infrastructure under the guise of educational worksheets.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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://ttraff.cc/wix?keyword=6+digit+place+value+worksheets+pdf
- https://static.usrfiles.com/ugd/50de67_1174fc8893c04222846a86f4da99710f.pdf
- https://static.usrfiles.com/ugd/f80014_a4f4c0ccd6454bc3a475e47666c8615e.pdf
- https://static.usrfiles.com/ugd/90c678_dafb59f49d2f4f739a77a604d97918dc.pdf
- https://static.usrfiles.com/ugd/e745be_dad3cf997f4e482fa6017e190ef2e51a.pdf
- https://static.usrfiles.com/ugd/77d535_8b68d787671c48a6b2babcd70089c0a5.pdf
- https://static.usrfiles.com/ugd/efb3f0_c440f73d93cd43faa5dff334332624a0.pdf
- https://static.usrfiles.com/ugd/b8c837_598d6818cebb42b9a47e2967aa1b1525.pdf
- https://static.usrfiles.com/ugd/b8c837_a0bf76ed2e9d4340941d420442a5ad67.pdf
- https://static.usrfiles.com/ugd/b8c837_c0580a59b5d24efdaaf91aa64aa08d9c.pdf
- https://static.usrfiles.com/ugd/3aee12_51b88622e8c044829df8a9d99d2fb2b7.pdf
- https://static.usrfiles.com/ugd/238140_67a45fb6c21245bbb2e7708edcb95720.pdf
- https://static.usrfiles.com/ugd/de65f7_1fe6a84d780b40988e7e4e0ed15cb15d.pdf
- https://static.usrfiles.com/ugd/b8c837_4a4f14071a4c426f88c4eb5238b1e70f.pdf
- https://cdn.shopify.com/s/files/1/0437/8204/5853/files/don_t_starve_together_cracked_multip.pdf
- https://cdn.shopify.com/s/files/1/0430/3981/7890/files/67078849122.pdf
- https://cdn.shopify.com/s/files/1/0430/5852/8405/files/cat_s_cradle_espaol.pdf
- https://cdn.shopify.com/s/files/1/0438/9647/1707/files/esvs_guidelines_carotid_stenosis.pdf
- https://cdn.shopify.com/s/files/1/0434/8693/7248/files/love_collage_photo_frame_app.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000669b.bin` `026f9c2904a5b389eb5887d228de8be671086e71f906c7bcc47b24438dfa7b52`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x669B	5692 bytes
`font_01_sfnt_off00007a05.bin` `09ac80ceb4bfa2d2c905a1f321f9e488fb0a66954bd5104ad5c454bbf740831b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7A05	10920 bytes

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