PDF malware analysis — malicious · 92da3e3baca919e3

MALICIOUS

PDF

45.3 KB Created: 2020-08-30 05:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 11b714b026f1d178278e8077a41d1611 SHA-1: 131845a38d837e1ba400a916c2e35cba529ce3f9 SHA-256: 92da3e3baca919e3b58381d3d0a160d089fdcf3fcc779cc412931425b8bac10c

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to external malicious content. The ML classifier strongly supports the malicious verdict.

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.com/wix?keyword=como+se+visten+los+nahuatl
- https://static.usrfiles.com/ugd/221f3a_1502a1fdc8c241aca160c90aa361e6f4.pdf
- https://static.usrfiles.com/ugd/ade4e6_d4579404bf6c44718f8231404144c372.pdf
- https://static.usrfiles.com/ugd/b8c837_e268caaef2da41fcadac0c154334b4f2.pdf
- https://static.usrfiles.com/ugd/b8c837_2834bcfd68bd46e392f192ff386ad85c.pdf
- https://static.usrfiles.com/ugd/b8c837_e205eb3363e2408e819946be9afc4edc.pdf
- https://static.usrfiles.com/ugd/d2751c_916217b6a9724fe88e00e45113682009.pdf
- https://cdn.shopify.com/s/files/1/0433/3902/2494/files/91433433722.pdf
- https://cdn.shopify.com/s/files/1/0432/8387/3942/files/jikeb.pdf
- https://cdn.shopify.com/s/files/1/0439/4539/4331/files/android_messages_for_web_not_showing_up.pdf
- https://cdn.shopify.com/s/files/1/0430/5272/8474/files/agile_processes_in_software_engineering_and_extreme_programming.pdf
- https://cdn.shopify.com/s/files/1/0433/4462/5822/files/ms_excel_vba_define_worksheet.pdf
- https://cdn.shopify.com/s/files/1/0433/5498/0505/files/31717388638.pdf
- https://cdn.shopify.com/s/files/1/0429/1110/5183/files/wijenuji.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_off00007151.bin` `3956459a30df0db7f9e69179aeb85cf4efb1a0fbe0c960c42f4fa8fe0a1e8edb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7151	4792 bytes
`font_01_sfnt_off00008175.bin` `eea784fc81dd790911dec185d27471fc91091fb661044f3f15db0f87be3314da`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8175	11512 bytes

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