PDF malware analysis — malicious · 977c6988332b1b17

MALICIOUS

PDF

37.2 KB Created: 2020-08-30 01:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f0995abce21e5f5dbc0eaa973000eb81 SHA-1: 60558521adf23a93b9323094a2046eb1e4fa80b8 SHA-256: 977c6988332b1b17eb3cd1fba4d8c3169c5baaaf8bb0137464d5240898e8b246

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=ina+needle+roller+bearing+catalogue'. The document body, though heavily obfuscated, contains references to 'Ina needle roller bearing catalogue' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The ML classifier 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.cc/wix?keyword=ina+needle+roller+bearing+catalogue
- https://static.usrfiles.com/ugd/b8c837_69eacfa2fd24478ab8177c7c07243d6e.pdf
- https://static.usrfiles.com/ugd/ae059d_75516f0340094c9d8ffd3929048a7ac2.pdf
- https://static.usrfiles.com/ugd/b8c837_eeeec7059f2c46c69f5ad0e5a6696a2e.pdf
- https://static.usrfiles.com/ugd/9757e7_f6fffa80ae844bd3ac7ca5ce152057ce.pdf
- https://cdn.shopify.com/s/files/1/0434/0252/6872/files/bipitiwibokagegawuxabobes.pdf
- https://static.usrfiles.com/ugd/5926b4_3a9c1cd44cb14c0c8746d948042c5b6c.pdf
- https://static.usrfiles.com/ugd/93c935_0107b358130f4d85b1894e45c8017237.pdf
- https://static.usrfiles.com/ugd/ab922d_8a67d18f8b7943fc92b402fbee4b0d84.pdf
- https://static.usrfiles.com/ugd/b8c837_cdb8c915d5d04509a775216ffb8b7c2c.pdf
- https://static.usrfiles.com/ugd/b8c837_a4a9cee938ca4245a75ec56c1f91d027.pdf
- https://static.usrfiles.com/ugd/b8bbd7_baf0ad683e6942958cc8daf56ce610c1.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000055f3.bin` `997d26b09b8a695535ec0310340df6a76f9cb9522d7ddd68185d06af7b483b85`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x55F3	5004 bytes
`font_01_sfnt_off000066fc.bin` `90a10d359c12612e3b37ae6c2b04ce042a2e9f90ecc7f4ddd14554608a06db51`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x66FC	9792 bytes

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