Malicious PDF — malware analysis report

Static analysis result for SHA-256 9595b1ed4f6aee56…

MALICIOUS

PDF

35.3 KB Created: 2020-08-30 03:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bcb803cd29e67fed26ebc5b10dd887d SHA-1: 69f03ad0315786d667f83c3f8f2c48be640cc991 SHA-256: 9595b1ed4f6aee5693012f396333e3b764a3e4981023bbd29374762e5ec07916
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though partially corrupted, contains text related to 'Cabal para principiantes pdf gratis' and the malicious URL, suggesting a lure for users seeking free content. The PDF also exhibits characteristics of a link farm, with numerous external links, many of which point to static.usrfiles.com. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=cabal%25C3%25A1+para+principiantes+pdf+gratis
    • https://static.usrfiles.com/ugd/2b25b5_81c6ae428dcc41588aa5213ee8310f6d.pdf
    • https://static.usrfiles.com/ugd/c1de29_cfb35b4ae63546aca516a777bee5670a.pdf
    • https://static.usrfiles.com/ugd/b8c837_209cea2bae7245a0a6236b62b357853e.pdf
    • https://static.usrfiles.com/ugd/0a0016_96ae974408064cadafa499fb5e11780b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8813a76683e41758b0793fc6c1a0021.pdf
    • https://static.usrfiles.com/ugd/87a178_b0f43caccd38415989def52d491ad5a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea18c6f43d984f198b1cf0c001dc39e2.pdf
    • https://static.usrfiles.com/ugd/40512e_ba934a5cfb884c6089f866c23998deec.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_788c613a973d4ac3ac292811cdfbfdce.pdf
    • https://static.usrfiles.com/ugd/48d9a1_beaf1960da744a3d90e4411414d45e36.pdf
    • https://static.usrfiles.com/ugd/3b47cb_8cea96f344554510b69899f6199c877b.pdf
    • https://static.usrfiles.com/ugd/af0aa9_98612abc7b4f407ca1406822a076482d.pdf
    • https://static.usrfiles.com/ugd/b8c837_79e5621b3b93465c933d78aa27bd31cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_486f1f31eea14163a8fc8d6835a42799.pdf
    • https://static.usrfiles.com/ugd/b8c837_426e891f1dd64b5bae7b05d0f50b8888.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_off000048c4.bin
bb85d721c14cc4df639e0831d09011b1271b58fbcc4b5d5b27cce4ec754b9630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C4 5604 bytes
font_01_sfnt_off00005b50.bin
e9cbb13252c3388940309941946e747874346d2ee84e6c9e11880a911f979b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B50 10968 bytes

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