PDF malware analysis — malicious · 1e7ad4288d77ef0b

MALICIOUS

PDF

32.4 KB Created: 2020-08-31 07:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 377f7fe88d2f13355ae202455a80888a SHA-1: 4563c95450897bce706bbee984c2d5093cbbaabe SHA-256: 1e7ad4288d77ef0b7478d8920e70c23faaf3fd5f68489587c0433b8dbc9bbf60

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious due to its inclusion of a link farm. The primary malicious URL, https://ttraff.ru/wix?keyword=c.+freeman+el, is a known malicious redirector. The document body, though heavily obfuscated, contains this and numerous other URLs pointing to external PDF files, indicating a coordinated effort to distribute malicious links. The ML classifier strongly supported 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.ru/wix?keyword=c.+freeman+el
- https://static.usrfiles.com/ugd/b8c837_a1aa3331b76b4f1cab0b80ad2e97d24b.pdf
- https://static.usrfiles.com/ugd/9ff9b8_bd9f9ca5ae2e48389aee90ddfb23c3dc.pdf
- https://static.usrfiles.com/ugd/b8c837_dc0290c9949c423c865e12435864e4ad.pdf
- https://static.usrfiles.com/ugd/affaa6_85009870fd9b498ab9b9e3ea585fd6a4.pdf
- https://static.usrfiles.com/ugd/b8c837_2b5273dffdb441f7a8ceb13b5a741aba.pdf
- https://static.usrfiles.com/ugd/61804c_c5be981e688e4e31bb56cefda7fd7e67.pdf
- https://static.usrfiles.com/ugd/3ce946_2974deb217384ebfbc5e9f18a26dfc74.pdf
- https://static.usrfiles.com/ugd/5af86b_7480dec3240e40d58b867ed0fde23725.pdf
- https://static.usrfiles.com/ugd/b8c837_672df19a5cb5463dae8a535bd7d428c0.pdf
- https://static.usrfiles.com/ugd/0a593f_ba79e624f2e24a5cba37b676d2f45ec7.pdf
- https://static.usrfiles.com/ugd/913720_1ed9a49863b141e190090b2da80213f3.pdf
- https://static.usrfiles.com/ugd/b8c837_73c3feb5774a4625a0513c9c1c281488.pdf
- https://static.usrfiles.com/ugd/b8c837_0a0445fbf03441d0a8e13c78aaf8a6cc.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_off0000433e.bin` `21ea4c8aef911a2c8b9d72e17b90aa642f0ac08f3f780e360ab8625aeaff5a49`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x433E	4672 bytes
`font_01_sfnt_off00005303.bin` `6bde1048db12f691ea61e394f841c1674f94ff9026ffa705b4edfaeb7c370935`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5303	10504 bytes

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