Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f83eec79e3bbc6c…

MALICIOUS

PDF

40.3 KB Created: 2020-08-29 23:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82fd3006e45131cff042b595b73dc5a4 SHA-1: 26d6514e8bb438d0ab558a24192f85bcb71b461e SHA-256: 6f83eec79e3bbc6c8d119c04cdc8b136d201a721697a35eb3b9f6e616764b9a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=que+son+las+praxias, which is likely intended to lead the user to malicious content or a phishing page. The presence of numerous Shopify-hosted PDF links suggests a link farm or SEO spam campaign.

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=que+son+las+praxias
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/gatutugutigetolodug.pdf
    • https://cdn.shopify.com/s/files/1/0432/2187/6899/files/jopatoko.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/23488655407.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/60609073122.pdf
    • https://static.usrfiles.com/ugd/b8c837_b245ac30c3ab4fa78e52fc08e4aee042.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_00fc96dcf3bc48f88d49e856f9c7b640.pdf
    • https://static.usrfiles.com/ugd/b8c837_e205eb3363e2408e819946be9afc4edc.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/jupomotatefinolikug.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/aviation_weather_4th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/vilupamoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/million_dollar_habits_brian_tracy.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/83437907348.pdf
    • https://static.usrfiles.com/ugd/b8c837_30bda6cbade347fe9b4b4577d96426f8.pdf
    • https://static.usrfiles.com/ugd/857e61_817c9ba1047948d5b3904ce46127f88a.pdf
    • https://static.usrfiles.com/ugd/a4d998_89af4ebaf3ac4e29ae6fe047f871c9e2.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e08.bin
63a18290f5e2ca79a686016b9cf76326870872d8d911e6f1885e97a2e7444944
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E08 4944 bytes
font_01_sfnt_off00006eeb.bin
2d76fc7b559195f1dc61dfe23ac4b62b614fe9451106dabce98ebc3311ba0637
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEB 11136 bytes