PDF malware analysis — malicious · 73ffb359d3bd2249

MALICIOUS

PDF

38.6 KB Created: 2020-09-13 12:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 281c1a228e7c87a66bbf90e7199b5632 SHA-1: 18cd30ba1c4e8ba46f77e51555e9989dd04166f7 SHA-256: 73ffb359d3bd2249eef493b756cf055b7ecb1c89f4d26a94d7f9630232f479eb

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, including a redirector URL and numerous links to other PDFs, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains the title 'Short quotes about friends with benefits' and the redirector URL, indicating a lure to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=short+quotes+about+friends+with+benefits
- http://nosin.turborenovations.com/uploads/1/3/1/3/131384778/9086224.pdf
- http://files.aprilgentry-sutterfield.com/uploads/1/3/0/7/130775758/3748530.pdf
- http://files.startnetsystem.com/uploads/1/3/1/4/131483235/5585516.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/9ff9b8_5845356631be43a29b76bf97576dac3e.pdf
- https://static.usrfiles.com/ugd/34e21e_30a98bec12864bc686b957e659d53fd9.pdf
- https://static.usrfiles.com/ugd/e4d7df_ac102f9d01474a1eb616fe9fdf6c859e.pdf
- https://static.usrfiles.com/ugd/c33f71_89f64f3549d04e0d9f3b76bd9f19d2fe.pdf
- https://static.usrfiles.com/ugd/c0fca2_c1f3f460cab24a878c3f82738d33e6ca.pdf
- https://static.usrfiles.com/ugd/140efa_236e3a25060f450494fe05707ed51587.pdf
- https://static.usrfiles.com/ugd/8bc2a6_4aa8a02e6ff04742aa64797aba49a6e6.pdf
- https://static.usrfiles.com/ugd/6a7407_31cb788921bb4ae891e2884dcb85f1d7.pdf
- https://static.usrfiles.com/ugd/3e9e83_5a50dea49916452b9a9aa7826b62b2fa.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_off00005703.bin` `8b313fdacdb0e20fa858ea1f83f7c1747e3568abe0bbb95280a3cb49438c716e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5703	5424 bytes
`font_01_sfnt_off00006975.bin` `02b02ac82c6d957063d48be3d7b2648f897178d2b8cb0e021d6c38975d257f93`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6975	10660 bytes

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