PDF malware analysis — malicious · 65e23c488d80d561

MALICIOUS

PDF

34.7 KB Created: 2020-09-15 10:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e7ad5e3aec3bae7963246001afd2478b SHA-1: c617450a543b5b164dd671df0adaff111d99e041 SHA-256: 65e23c488d80d56193bd0bb0d9f9e7797355064372286c15775d8c34e72ce95b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a known malicious redirector, which in turn leads to a link farm. The document body, though heavily obfuscated, contains text related to an 'audiobox usb manual' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links points towards a link farm strategy to distribute 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/pify?keyword=audiobox+usb+manual
- http://files.doublephorsemanship.com/uploads/1/3/1/4/131407469/3679261.pdf
- http://files.crowdfundingandlibraries.org/uploads/1/3/0/8/130874633/vafaxofefije-pubevuvup.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0437/9141/7495/files/punch_home_design.pdf
- https://cdn.shopify.com/s/files/1/0432/4517/4939/files/ratemajosisog.pdf
- https://cdn.shopify.com/s/files/1/0432/1679/7857/files/56081143744.pdf
- https://cdn.shopify.com/s/files/1/0431/9870/9917/files/belkin_n600_setup.pdf
- https://static.usrfiles.com/ugd/d79848_b3bf3389ec474a75bb356b08317e2ab0.pdf
- https://static.usrfiles.com/ugd/3e5db3_c4f1ead6e16c46c999e8968049b15cc3.pdf
- https://static.usrfiles.com/ugd/faa7ef_cf7543728ff94e43806ebfdbafb819f8.pdf
- https://static.usrfiles.com/ugd/89602e_b1acc9a4afce4f0ab5c67a0299f8b1a0.pdf
- https://static.usrfiles.com/ugd/1d5a3f_3e412524351147f59b267a7cbe95878b.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_off00004ca3.bin` `14b68889270d5bfd61a92246278af4bdbec0ddd9928773eb4f3fcf4462de00b5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4CA3	5072 bytes
`font_01_sfnt_off00005dcc.bin` `5e834e263cc13fa7ac16fa3864358fa3fa4882732e021ce670ab974e5cebe9dd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5DCC	9700 bytes

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