PDF malware analysis — malicious · b135cb91179d5dfa

MALICIOUS

PDF

38.2 KB Created: 2020-08-30 06:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 342fbc01a53d988142a1bee27fc82903 SHA-1: ea295a9c3f7b0073b3aed7cfb19e83b4eb01503c SHA-256: b135cb91179d5dfa2f9ff67ea8b19bc485fbacc0613bda0d5f447bb7a2e127f2

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to 'ttraff.com' which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDFs hosted on 'static.usrfiles.com', suggesting a link farm designed to distribute malicious content. 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=legend+online+hile+apk
- https://static.usrfiles.com/ugd/b8c837_78933278833e4d14aec1e5388937cc2b.pdf
- https://static.usrfiles.com/ugd/b8c837_9c0dfbb803454a58ae86d92512682165.pdf
- https://static.usrfiles.com/ugd/b8c837_292b33e770de484aaf91ce4a74933f5e.pdf
- https://static.usrfiles.com/ugd/8de238_db9c42f64472465d998fe28ac312bccf.pdf
- https://static.usrfiles.com/ugd/23e9be_041dd8ce5997446f9aaca52bfc5f1084.pdf
- https://static.usrfiles.com/ugd/b8c837_a68e02830b39473f841d86b02c2a8941.pdf
- https://static.usrfiles.com/ugd/ce14f3_cbe928cb71b943c19256717e76156b05.pdf
- https://static.usrfiles.com/ugd/b58d21_be45677c0fb2411a8a829d72d0daf7ef.pdf
- https://static.usrfiles.com/ugd/ea78e0_92c2be3a416b430e9991ceb868825522.pdf
- https://static.usrfiles.com/ugd/7f929b_03e1dcf2399c4cf78b2387b5ab3b46a0.pdf
- https://static.usrfiles.com/ugd/6846fe_ab802d87381f49c6b7956360c92aac5f.pdf
- https://static.usrfiles.com/ugd/1cfe37_d458656441314c9bacf056a5ac547b09.pdf
- https://static.usrfiles.com/ugd/067ecb_00db6b19b0e64a928d9e09004a730606.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_off00005795.bin` `79220151c62fb15998e57f6787bca1eaaa3809b7eee9e09404684d65f646a753`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5795	4952 bytes
`font_01_sfnt_off0000686f.bin` `3133c4979ef7969b283969542be4856406452abe6d17961620662a47426ba42d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x686F	10592 bytes

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