PDF malware analysis — malicious · a1499c654b60abbe

MALICIOUS

PDF

130.4 KB Created: 2020-09-06 02:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: df0bde161c47df735af92a5aa66dc6dd SHA-1: 4a5cf8825ab4ec1156c8c2075957b076a129a15d SHA-256: a1499c654b60abbe25a7ffc350389ebcabd7f0f6075b3e2a83af01b9954ad898

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL. The presence of numerous embedded links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggests a common tactic for distributing malicious content or conducting phishing campaigns. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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=4th+degree+black+belt+taekwondo+form
- https://cdn.shopify.com/s/files/1/0465/2761/1038/files/gigatron_polovni_racunari_tuzla.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88020392138.pdf
- https://cdn.shopify.com/s/files/1/0431/0417/4233/files/california_dmv_handbook_2016.pdf
- https://cdn.shopify.com/s/files/1/0437/7837/5831/files/surah_yasin_download_arabic.pdf
- https://cdn.shopify.com/s/files/1/0432/7427/2924/files/27767118126.pdf
- https://static.usrfiles.com/ugd/b8c837_33b5473b48854912a814f3597e7a1539.pdf
- https://static.usrfiles.com/ugd/1849a1_111df887677e4c629f81b71200af925d.pdf
- https://static.usrfiles.com/ugd/99b222_19cd4337c78f4509917c885e191ce73f.pdf
- https://static.usrfiles.com/ugd/6116da_044460fb2bcb4429b449ed805dbe5fb2.pdf
- https://static.usrfiles.com/ugd/1be480_b65bbf59c5ce4e3d8b597f286697f826.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_off00013a06.bin` `630f0db71e7d6303bfef159009a6ea309f5d90fc03a23b03be8774234cd3eff7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A06	44676 bytes
`font_01_sfnt_off0001c2fa.bin` `15be4c7349ff82fa7501876e7714040d72a2f5379a24f2f273492af9fd3b0270`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C2FA	5548 bytes
`font_02_sfnt_off0001d5ca.bin` `36bd59369ee253c86eb7237868ddb9b13ca73fe9fa33c3279f52f1280f3a1668`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D5CA	11404 bytes

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