PDF malware analysis — malicious · bdc10e18a938a507

MALICIOUS

PDF

32.7 KB Created: 2020-09-01 03:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f7e804a3a52080b43a33457bd9113483 SHA-1: eff170a22aa3a6679f40b974e20102ba03ad43a2 SHA-256: bdc10e18a938a507a12e16df88506970b011a4afe1d75caed83d2b82c66f1a57

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=robot+breakdance+music', which is also listed as a suspicious URL. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', suggests a link farm intended to obscure the ultimate destination and potentially evade detection.

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=robot+breakdance+music
- https://static.usrfiles.com/ugd/b8c837_47290f84890a4e0d8e292dde9666bc21.pdf
- https://static.usrfiles.com/ugd/19103d_1d34aaa9977a422ba8f997c292414928.pdf
- https://static.usrfiles.com/ugd/77eba6_eaa07686bcdc4fec9fba4f20815c9c03.pdf
- https://static.usrfiles.com/ugd/3aee12_776700f9b24b40d7b558ea539c96d1c8.pdf
- https://static.usrfiles.com/ugd/50de67_3ee48ecb261e40daa2a74403fa00768a.pdf
- https://static.usrfiles.com/ugd/b8c837_7a2a6f31a632415b9c76541145582218.pdf
- https://static.usrfiles.com/ugd/d775a9_b22bcf9a27484b17aa55ba9032cd6da8.pdf
- https://static.usrfiles.com/ugd/5ad03d_67ea5358c19d4890bf6050668274c4e5.pdf
- https://static.usrfiles.com/ugd/50c35f_650813a3e77e4c1c81cd06ab9d3d125c.pdf
- https://cdn.shopify.com/s/files/1/0431/2619/4330/files/go_math_grade_6_printable_worksheets.pdf
- https://cdn.shopify.com/s/files/1/0427/7056/3239/files/british_council_ielts_reading_answer_sheet.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_off0000427c.bin` `e87eefcb24b1f46b23ea96834bdfd87742a3625ee9d6779279b7191347d3906c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x427C	5264 bytes
`font_01_sfnt_off0000544e.bin` `bdc5c3159549414544d7a2a3f7320f222d6a2fa72e33afa8ac403161864ee8e8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x544E	9940 bytes

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