PDF malware analysis — malicious · 7a291401a1807242

MALICIOUS

PDF

39.1 KB Created: 2020-09-06 05:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 4a6a6a67b70bd1c0f3706cb2c709a05f SHA-1: 4c0a6dbcd8b92a43eaa2950d42ad4bbd54928eb2 SHA-256: 7a291401a1807242c0a3ec0e3edf5807f25879019d3985bf9c40ee217e203399

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL, 'https://ttraff.club/wix?keyword=how+can+i+answer+happy+birthday', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and appears to be designed to disguise a link farm, likely for SEO poisoning or to distribute further malicious content.

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.club/wix?keyword=how+can+i+answer+happy+birthday
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/0aab01_5fb82e6d813b4265a65d478346b25f6f.pdf
- https://static.usrfiles.com/ugd/b8c837_7fb9aedc51804b0da9bd5ac73ec33ef4.pdf
- https://static.usrfiles.com/ugd/b8c837_04244193227144738393786ac1a82aa0.pdf
- https://cdn.shopify.com/s/files/1/0429/9938/2170/files/pride_and_prejudice_study_guide_answers.pdf
- https://static.usrfiles.com/ugd/b8c837_7f5ba125a79c4493881924967ba8e647.pdf
- https://static.usrfiles.com/ugd/f68081_c3394d4528ac406cb41b242e18ae6184.pdf
- https://static.usrfiles.com/ugd/b50c55_9686b8db02634f3c90623d08e32a7dc7.pdf
- https://static.usrfiles.com/ugd/23b571_ed4525b117ae46c98575ffc728438059.pdf
- https://static.usrfiles.com/ugd/b8c837_8b921cfaf69c4d6ab3c0c9fec767e3f7.pdf
- https://static.usrfiles.com/ugd/b8c837_fab523f10d7e4bb492aa6d202f99fb48.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005b0c.bin` `b1f84b520132383a478a78dd4f05c8a5c4499dcd4827c12e105c4ec1a3479ae3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B0C	5424 bytes
`font_01_sfnt_off00006d86.bin` `60a9a72a011d8dc17e2227560fdf2240f0cd32276d10c8c814188ef2317427ed`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D86	10088 bytes

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