PDF malware analysis — malicious · 21c7c38a75acc9ab

MALICIOUS

PDF

38.9 KB Created: 2020-08-31 10:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a2ff2dcba98d8acc6f707626bdfaa24e SHA-1: 837c9548c3b082594b29bd4e91ed6dbe3408881a SHA-256: 21c7c38a75acc9aba5f4f28e26d99b69a37a33050b07e333ef009a637b49196a

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to 'Stewart calculus 6e' and the malicious URL, suggesting a lure to download or access potentially harmful content. The presence of a link farm and the ML classifier firing further support malicious intent.

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=stewart+calculus+6e
- https://static.usrfiles.com/ugd/b8c837_3a53140c68e54a268f467692d0803f34.pdf
- https://static.usrfiles.com/ugd/f3ecbe_457bb54e4ece4ede9d64b9ca9f1c28cd.pdf
- https://static.usrfiles.com/ugd/8de238_e9227e86aea44788ab0303ff5db8e4bf.pdf
- https://static.usrfiles.com/ugd/b8c837_d5c930cd192341068dc5cb433cd6616b.pdf
- https://static.usrfiles.com/ugd/b80405_b18db9bd18094b74b604132da287c064.pdf
- https://static.usrfiles.com/ugd/b8c837_c72d4cc9d08e407a96a115c73616bcef.pdf
- https://static.usrfiles.com/ugd/b5aed9_d974b26062d341c79dff71f97cd6ee28.pdf
- https://static.usrfiles.com/ugd/b8c837_2194ea78d2544d08ad7d57aa5fd3d928.pdf
- https://static.usrfiles.com/ugd/b8c837_ad69518613604b57992494a838919344.pdf
- https://static.usrfiles.com/ugd/b47706_a62c8823e8bb473598bea2cb5a218772.pdf
- https://static.usrfiles.com/ugd/45e30f_f115c69181084a7297558ce527558708.pdf
- https://static.usrfiles.com/ugd/63d3ad_b3d371aca3874755beb7164d3c9e0168.pdf
- https://static.usrfiles.com/ugd/eb4c03_deed6ccf22f549d6b8b2e05d59a54ef3.pdf
- https://static.usrfiles.com/ugd/b8c837_d92458ecee1c45c6b35af5bffbd129bb.pdf
- https://cdn.shopify.com/s/files/1/0432/0083/9842/files/juwal.pdf
- https://cdn.shopify.com/s/files/1/0431/4143/1464/files/42117997690.pdf
- https://cdn.shopify.com/s/files/1/0440/8626/3960/files/best_trucker_gps.pdf
- https://cdn.shopify.com/s/files/1/0435/1007/1460/files/lovegovedeluwi.pdf
- https://cdn.shopify.com/s/files/1/0434/2113/9096/files/pufurapis.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_off0000594a.bin` `07cb6c5fc82dac496f42916ba882e2ee0fbafbcd507262691a6dcf1776359654`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x594A	5140 bytes
`font_01_sfnt_off00006adb.bin` `677ffa24c3642f2ace4c3181989e72434a7236a6dbbe14237e9cbe2280f02120`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6ADB	10708 bytes

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