Malicious PDF — malware analysis report

Static analysis result for SHA-256 decd4f7e278b47f0…

MALICIOUS

PDF

47.8 KB Created: 2020-08-30 03:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 406f7f1a765a587981f398f8038f1e95 SHA-1: ed5c268e3d722580392f02fc0e3e5c0c4415d3c9 SHA-256: decd4f7e278b47f05989e03b52043b87625cee9ccccdc717ba7f85bfa4d868ac
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is likely used to direct users to malicious content. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure related to statistical hypotheses. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to drive traffic to the malicious URL. No scripts were extracted from this sample.

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.cc/wix?keyword=hipotesis+estadistica+que+es
    • https://static.usrfiles.com/ugd/cd79e3_d4d151df174e46209a8d5b70946024bc.pdf
    • https://static.usrfiles.com/ugd/67e251_cc8bd330cf7b4181b9827cffdf0d7dc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_64e5bb49698a4c9bad2780874bc10da0.pdf
    • https://static.usrfiles.com/ugd/e2c250_723fdd1411684be6aeb5f9c3ee3d104d.pdf
    • https://static.usrfiles.com/ugd/b8c837_85d4b6f958204b24b3f2a9278f2e0a7a.pdf
    • https://static.usrfiles.com/ugd/40b9e6_c0a8f884146840e0868d4e29d4bf74c2.pdf
    • https://static.usrfiles.com/ugd/e643da_99dd89b59d9c471aada79024e58d2742.pdf
    • https://static.usrfiles.com/ugd/d54300_1008346048de49b78b744dda8f4d3883.pdf
    • https://cdn.shopify.com/s/files/1/0429/3754/8959/files/git_ir_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/97872567727.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/clinical_pharmacology_and_therapeutics_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/87335587323.pdf
    • https://cdn.shopify.com/s/files/1/0432/9583/4280/files/87418372717.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3751/files/bel_ami_livre_de_poche.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_off0000790b.bin
4171103562a47d220f89ccd222315b8c3e55f2e0ddcc675bad9930f00fc35a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790B 5028 bytes
font_01_sfnt_off00008a2c.bin
bcd48d1240fd98ecce6a71c06dc7afb28e6e7a7fe42c20d6a4d96f2beb53c762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2C 11940 bytes

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