PDF malware analysis — malicious · 74b0e02a526e7f30

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 23:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c36f89c553d98c43b28aa3b7c0d7029e SHA-1: e9f20037c05468313129cb45a0aaf2c6107c1505 SHA-256: 74b0e02a526e7f304871d2da094f3a7717cc11e43f801dcf3164588e66c4e078

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. The sample also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to host 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.cc/wix?keyword=zhu+zhu+pets+instruction+manual
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/fac845_8f73f8d33f3543e880018565c0e36e9e.pdf
- https://static.usrfiles.com/ugd/b8c837_3da60ba9e8a74f18909528e11daa4978.pdf
- https://static.usrfiles.com/ugd/b8c837_99ab475b41a142b8b91bf48faf579473.pdf
- https://cdn.shopify.com/s/files/1/0432/1096/5147/files/renorasawo.pdf
- https://cdn.shopify.com/s/files/1/0427/5719/3895/files/lulebosawew.pdf
- https://static.usrfiles.com/ugd/b8c837_910ca1f853d14bbd9914e32619b9fbc3.pdf
- https://static.usrfiles.com/ugd/b8c837_b9a42f47445e48849989b37a702e4ada.pdf
- https://static.usrfiles.com/ugd/e3ff21_722f92b3194d4ab3a7c3d2d78236e289.pdf
- https://static.usrfiles.com/ugd/b8c837_ea41ad8af7544b85a84fa16b69343393.pdf
- https://static.usrfiles.com/ugd/8ab72e_c158665257b843ffad1c10a1f054aaf0.pdf
- https://static.usrfiles.com/ugd/5cf23b_9c1967b358b54032805f0290e099e911.pdf
- https://static.usrfiles.com/ugd/2274a7_56e471a446784bc4bcae28c6b65cd4ed.pdf
- https://static.usrfiles.com/ugd/b8c837_2a7a3304c6474d6ca47f26549268ee81.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_off00005eaa.bin` `e6278a3ac0ace3c36a0105a7cbea0fc8aac6478058f91735ab5f8b6209aa6d72`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5EAA	5180 bytes
`font_01_sfnt_off00007016.bin` `c92f124564f2b9a5ea5c4b8ce8140fa32726ee4320bb1bdbb009134b1c5cd786`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7016	9852 bytes

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