Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8435fedac199609…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 21:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 658d03561f656d92184030d84fb6537e SHA-1: 82d2e81cf223580a94de1fa67eeaaa20446b53b9 SHA-256: c8435fedac1996099283a6134c6b52bacd727e654f14940525701357b8d38359
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.ru/wix?keyword=up+deled+marksheet+2018'. The document body, though heavily obfuscated, appears to contain this URL and a fake title related to academic marksheets, suggesting a phishing lure. The file also contains a large number of embedded links, many of which point to benign content, but the primary malicious link is clear.

Heuristics 3

  • 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.
  • 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=up+deled+marksheet+2018
    • https://static.usrfiles.com/ugd/b8c837_07a66f47cd6d43139eb519c32810930a.pdf
    • https://static.usrfiles.com/ugd/93971e_2238d90953214dc5b598be7b18b85490.pdf
    • https://static.usrfiles.com/ugd/c068f8_4d132ec257eb42dca57b7d09f64288e6.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/trembler_catherine_laborde_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/askeb_blighted_ovum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5330/files/wamenedafodevuxizevoke.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/bedisoligoralapi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3936/6047/files/banking_system.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb48b2bb6e89477e84b4f4b180b3be05.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_6823f31141f247f0aeec6d962d56bfea.pdf
    • https://static.usrfiles.com/ugd/de65f7_e41fba9faf4740cab3e4cbb241d2a7c3.pdf
    • https://static.usrfiles.com/ugd/80bfa9_55129ad5338d46339378845852800004.pdf
    • https://static.usrfiles.com/ugd/29c71c_df193fcd0b814471849f049402999655.pdf
    • https://static.usrfiles.com/ugd/9219f8_5fbcd154b15b4f08b2f349f1b582f913.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ce99a55629c4b23afebda09f8cda3de.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf703661b1b440a5b9a3181c2ce5b30c.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.

FilenameKindSourceSize
font_00_sfnt_off000060c4.bin
0b0e4f929c813cddf6a2c1a29adc38a81eda46b70ea0e7d8bf2b4c5a3839c3a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 5772 bytes
font_01_sfnt_off0000743e.bin
ff69859d9bc98814f0ea427cbf412b1c04f2465959f8f9eb40044b287a66ea71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743E 10364 bytes

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