PDF malware analysis — malicious · 4bd2d02fc3fe9ea4

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 05:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 07cc219b00cec4706c442bb7033aa3d3 SHA-1: ae568bc5f5b7bef8b886547e5095c73a8bc7ce8f SHA-256: 4bd2d02fc3fe9ea4d09c1dc4a774d755b24d79c3efaea9f38a031317b6906a45

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF document contains a mass external link farm, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users interested in Suzuki violin books. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of SEO poisoning or link farm tactics.

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=suzuki+violin+book+4+table+of+contents
- https://cdn.shopify.com/s/files/1/0429/5596/4569/files/60380597192.pdf
- https://cdn.shopify.com/s/files/1/0428/2017/3983/files/pdf_ethnography_of_communication.pdf
- https://cdn.shopify.com/s/files/1/0428/9318/1081/files/6343292265.pdf
- https://static.usrfiles.com/ugd/b8c837_3c887b865a5f4f738340d14dd2f2c369.pdf
- https://static.usrfiles.com/ugd/fd3290_2c7f5b2fd53d4909a28c237e5b81386a.pdf
- https://static.usrfiles.com/ugd/ed64d2_d20bbee716044e80a5077145ce55272a.pdf
- https://static.usrfiles.com/ugd/b8c837_07c683f01f4c44509e102f304d117095.pdf
- https://static.usrfiles.com/ugd/238140_9f0a444fd597441f86cb7fd3902102c0.pdf
- https://static.usrfiles.com/ugd/cd79e3_1bd9b1df69db4e6ca3005ffb31792641.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
- https://cdn.shopify.com/s/files/1/0432/3390/2760/files/kulosetip.pdf
- https://cdn.shopify.com/s/files/1/0454/2945/7064/files/xaxuwuzevedawugejaxiwi.pdf
- https://cdn.shopify.com/s/files/1/0434/4204/5090/files/barudipebu.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_off00005fe6.bin` `86b52b41362b50e0fdc97d989664fd51df86e971a421333552dcf6e2a08b158a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FE6	5284 bytes
`font_01_sfnt_off0000720b.bin` `f808b0bc6edf7e92b3715bc8ca64782abf579ff9df9f912200af18195a6cb81e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x720B	10548 bytes

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