PDF malware analysis — malicious · c5aa5e45a6b6143e

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 17:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d4ec940599df07843969e76b28abe546 SHA-1: 678f5b2eb5840e9dede47761132434d524663fc2 SHA-256: c5aa5e45a6b6143e4bc00a2302670b9fadf28d659cbcb2ad7cc9539f5aa9cda9

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to benign content, but one critical link directs to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, contains text related to 'Terraria armor list' and the redirector URL, suggesting a lure for SEO spam. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.com/wix?keyword=terraria+armor+list
- https://cdn.shopify.com/s/files/1/0447/2219/2537/files/tennessee_williams_the_glass_menagerie.pdf
- https://cdn.shopify.com/s/files/1/0431/9651/4461/files/dijazoferun.pdf
- https://cdn.shopify.com/s/files/1/0431/5470/2496/files/65880231542.pdf
- https://static.usrfiles.com/ugd/9219f8_92f53a81192e4feda0880e1f847c6fa7.pdf
- https://static.usrfiles.com/ugd/b8c837_f190770c6c074c80a9063f0f03d98476.pdf
- https://static.usrfiles.com/ugd/b8c837_468650001d664a0993cf9f4379b8f796.pdf
- https://static.usrfiles.com/ugd/1e32c2_c48c2f792b454dee94bc38783e9d9b3b.pdf
- https://static.usrfiles.com/ugd/409ca8_9017b88eb9ff460297f6fca9e6955f0b.pdf
- https://static.usrfiles.com/ugd/b8c837_50fb5fd106654119a8fcc2913c9d35d5.pdf
- https://static.usrfiles.com/ugd/05900a_3948ed7e1d6642a592f3713a03581c0d.pdf
- https://static.usrfiles.com/ugd/b8c837_3b07c0ad5932484788e556414f4ebab2.pdf
- https://static.usrfiles.com/ugd/b8c837_693ee6fde0234f50981d66cb7a8eb40f.pdf
- https://static.usrfiles.com/ugd/b8c837_bab4fb75bd07401dbd7e7bf39f9660f0.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_off00006a5c.bin` `eca0950eed6b693af26756e557206434b911f7cebd99f2612775b1a90c0458e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A5C	4780 bytes
`font_01_sfnt_off00007a7e.bin` `36488857915c187c09e998f39e7b83316e90b557b0be3af95e519d50c8574b0a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7A7E	10140 bytes

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