PDF malware analysis — malicious · e3fb7c2bb33dff4a

MALICIOUS

PDF

53.7 KB Created: 2020-08-31 01:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0ae8eab85ead43f4b7a72ed9ab1fb2cf SHA-1: f09b9c1c335a16f6868a6c99940e9fc9328e2630 SHA-256: e3fb7c2bb33dff4a53085f933a71d06193d91931f32c8593793c6bfd1b28d8e0

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains the URL https://ttraff.ru/wix?keyword=irc+83+2018, which is identified as a known malicious redirector. Additionally, numerous links to PDFs hosted on static.usrfiles.com were extracted, suggesting a link farm or SEO manipulation tactic.

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.ru/wix?keyword=irc+83+2018
- https://static.usrfiles.com/ugd/158fb9_ff9bb8a9b83b4bb797ef02db26520603.pdf
- https://static.usrfiles.com/ugd/9ea9b6_f7ffa8b825f1470297ea65b5bb7aee50.pdf
- https://static.usrfiles.com/ugd/01bc73_780259cab08a4ee7b0c051779ebf6de7.pdf
- https://static.usrfiles.com/ugd/b8c837_b6a0c254e9d043a987520a9b34e0cff9.pdf
- https://static.usrfiles.com/ugd/87a178_5006b80ec07f4c4193de36920ff76569.pdf
- https://static.usrfiles.com/ugd/c3f88d_7046f9fc86c3401aa702d626ef684c7f.pdf
- https://static.usrfiles.com/ugd/b48b60_bcaea2ddea54434e99dcbb47a90a4c20.pdf
- https://static.usrfiles.com/ugd/b8c837_cd4141fcf85948148f7b269342f39ab0.pdf
- https://static.usrfiles.com/ugd/b8c837_b72dee6326534a7fa73e2601425d7c25.pdf
- https://static.usrfiles.com/ugd/b8c837_99bc11497dc34e3d9d1ab12ef2ae3b82.pdf
- https://static.usrfiles.com/ugd/739437_cd73942695124f6ba5c5e67a638e5599.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00008b96.bin` `44106ae37f3ce3662ab559a70baebd31df7f1f1d611f2b2a1bc5e94f770c2b7c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8B96	4320 bytes
`font_01_sfnt_off00009a2a.bin` `b048a6c9e74407cd7a6efda830533570359a094591839204e79ca27b5d108a6f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9A2A	10020 bytes
`font_02_sfnt_off0000bc8f.bin` `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBC8F	4324 bytes

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