Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c5e16b75942c7b…

MALICIOUS

PDF

40.3 KB Created: 2020-08-30 12:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ae52927f2309ed93d82584c00e8699c SHA-1: 31ec78f59a9173e1ef289c33dbd0c77ce734d962 SHA-256: 48c5e16b75942c7b73b7062070f2ab7bc07f245c81de452ed65253114bd017b6
120 Risk Score

Malware Insights

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

The PDF contains a link disguised as lecture notes that redirects to a known malicious domain, ttraff.com. This indicates a phishing or redirection attack. The document body, though heavily obfuscated, contains the same URL. The presence of numerous other PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to improve the ranking of the malicious redirector.

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.com/wix?keyword=acca+f1+lecture+notes+pdf
    • https://static.usrfiles.com/ugd/ce0e6d_00821937453f4a74acd5563d856a9125.pdf
    • https://static.usrfiles.com/ugd/52b593_9ffab83ea4df44618ba297ae4bd5ec70.pdf
    • https://static.usrfiles.com/ugd/8cbfce_6da05c657ad342f28605f44b0609ff64.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/kafatokokekebefodenime.pdf
    • https://static.usrfiles.com/ugd/b7306e_5cdbe6378d744cda90fcfa85fbea6de4.pdf
    • https://static.usrfiles.com/ugd/a1fb72_d085bdc4018348b89b9c42b0ef31c998.pdf
    • https://static.usrfiles.com/ugd/3e9e83_dae897a2a51b4b6ea11f5c8c77d59d4f.pdf
    • https://static.usrfiles.com/ugd/20d83a_93b6849e7e624f929998f16f37e2fa02.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/avon_catalogue_january_2019.pdf
    • https://cdn.shopify.com/s/files/1/0450/2568/9758/files/xupezefizekosefuwojexadif.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_off00005ec7.bin
629d16a5e5f7058f582d65fc218553e0e4090848f9dbaa43e7b7ae755ac4381c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC7 5188 bytes
font_01_sfnt_off00007078.bin
9c8d92be8ab4d370b47736e1679e2b0d1b47c03fdc076fe5c48840f0577d1fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7078 10820 bytes

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