PDF malware analysis — malicious · b61bf3f507134d86

MALICIOUS

PDF

38.6 KB Created: 2020-09-01 05:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 32ee08dc0d3bac6912932d75839fc64f SHA-1: cfd4c853afb86241d193dde4ccee9e475bef7614 SHA-256: b61bf3f507134d8683096b877dc0e53bb4a724a12fcb688ed724675664c90e80

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious payload. The document body and embedded URLs suggest a lure related to a song ringtone, aiming to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure contained a large number of external links, many pointing to Shopify domains, likely for SEO manipulation to increase visibility.

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=bepanah+pyar+hai+aaja+instrumental+ringtone
- https://cdn.shopify.com/s/files/1/0433/8139/1514/files/kigudulonafupape.pdf
- https://cdn.shopify.com/s/files/1/0432/3685/1874/files/cgeit_review_manual_2020.pdf
- https://cdn.shopify.com/s/files/1/0435/7757/3539/files/65522706995.pdf
- https://cdn.shopify.com/s/files/1/0434/1897/6408/files/ssh_keys_permissions.pdf
- https://static.usrfiles.com/ugd/0cd3a8_ecaebf79c5534e959ac154a97de028ab.pdf
- https://static.usrfiles.com/ugd/6cfc61_8aecd708d78441dcb9f5ef23fdccc722.pdf
- https://static.usrfiles.com/ugd/764aaa_31cc9814be194c1fa9dc3b8f545b8214.pdf
- https://static.usrfiles.com/ugd/6f58fb_817e6a8a36ad467fa53779765958e473.pdf
- https://static.usrfiles.com/ugd/7603ae_662e235ba6df42e2bdf595d4d89d1478.pdf
- https://cdn.shopify.com/s/files/1/0438/6209/8085/files/rilutubijemogejavijomowiw.pdf
- https://cdn.shopify.com/s/files/1/0431/2884/8538/files/git_update_from_master.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_off00004cc8.bin` `70f15e441dd69a2a342c549df159fc45331dc7a77f0f45d4ed4714865a0270ac`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4CC8	5460 bytes
`font_01_sfnt_off00005f41.bin` `761ea27093c6039017e037a20616f448b434fa7f491ab5a46d4205f7fc5f8d2d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F41	14288 bytes

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