PDF malware analysis — malicious · 7ca96b906a06c667

MALICIOUS

PDF

34.2 KB Created: 2020-08-30 22:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 379e9e5cb48a9520816f06f688cba19c SHA-1: 05b21f5e47bfd461538eadcc6bb03f97dc83897b SHA-256: 7ca96b906a06c667c5187ac7ddb939c14a124daaf30b92d992a0c17aa158e68f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to appear as search results for specific documents. One prominent link, 'https://ttraff.cc/wix?keyword=benson+microbiology+lab+manual+13th+edition+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other URLs hosted on static.usrfiles.com, suggesting a coordinated effort to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=benson+microbiology+lab+manual+13th+edition+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/defcb2_d28b2a4076d544e0b72daeea9cbb811e.pdf
- https://static.usrfiles.com/ugd/b8c837_132eb013f89043e59db09a7000f93195.pdf
- https://static.usrfiles.com/ugd/0c4177_9c06e6cbb86742bda55fb10f519c3214.pdf
- https://static.usrfiles.com/ugd/b8c837_7a9d218db1734f8c8b821eedfad2348a.pdf
- https://static.usrfiles.com/ugd/b8c837_f71b5057ffa44e138626de63a8734e41.pdf
- https://static.usrfiles.com/ugd/868401_841d14a46e7649548d508d88f5eea69c.pdf
- https://static.usrfiles.com/ugd/cac9e4_af2e9c1fb11a48548c50d616e19d5966.pdf
- https://static.usrfiles.com/ugd/9ff9b8_1ab8a724f4cc4b5aaf3416bdf9ff49d4.pdf
- https://static.usrfiles.com/ugd/b8c837_806b2b18fa214e2bacc28d818837308f.pdf
- https://static.usrfiles.com/ugd/b8c837_9b344450f25b49bf95e1d2fa05b85f01.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_off0000449d.bin` `06c84e080fe2de0dd91eb3e098af63a8fb796ebba4a448749c15fd80315378f8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x449D	6076 bytes
`font_01_sfnt_off00005920.bin` `e5a17b9385de0d5d21a1f6786b429da41765b948bfdf4f67671aa0753b2ceb2a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5920	10272 bytes

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