Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbec9ee869f3c645…

MALICIOUS

PDF

48.2 KB Created: 2020-08-30 17:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb3340eff7432bae20a85068d7880b80 SHA-1: 77dad747b42f5d7df6710dfcec5632bb780378aa SHA-256: bbec9ee869f3c64546559c4d4cb3f2b551edd1224d20cdf6830bf346e924d8b9
150 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.com'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external links, many of which are hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.com/wix?keyword=diagrama+del+ciclo+de+krebs', is the primary indicator of malicious intent, likely serving as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=diagrama+del+ciclo+de+krebs
    • https://static.usrfiles.com/ugd/b8c837_5c954b95b6f746faaf3d307c7670caea.pdf
    • https://static.usrfiles.com/ugd/b8c837_17bd92d207f64c118ff2cb3aafd13f8f.pdf
    • https://static.usrfiles.com/ugd/b4609a_7211de26f3b640aa91c8eb5794c93211.pdf
    • https://static.usrfiles.com/ugd/b8c837_c62b0ca635714a35b740dc300f0a3207.pdf
    • https://static.usrfiles.com/ugd/e4ff69_ef3da962030e44bb81d6874537648104.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_4fded145d3264154a93791d734558efc.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/keporog.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/falitej.pdf
    • https://static.usrfiles.com/ugd/e73fea_2703c6a1b3e547c18c60af8edd962978.pdf
    • https://static.usrfiles.com/ugd/6116da_c32a8ef3ac9b4762b16e3dd6d1f25949.pdf
    • https://static.usrfiles.com/ugd/de02f3_2d933d0047614e78993ffd7b8d8b57e8.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_off00007b7a.bin
47eda7a669bfbd84808a08170017ad6d5c77b21c4b3116c6dd45b1d6620132c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7A 5464 bytes
font_01_sfnt_off00008df5.bin
e55b43cdf0f1b7b8ba9d1c8781c8e8e4122c1bb4ddb744546543b9f0052324bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF5 11220 bytes

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