Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94ed270c774cddb…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 06:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc258a055d84c3b5b5821965c8a0713b SHA-1: f96f1e96ef215c21aa91bcae5cfd57b98d651af6 SHA-256: d94ed270c774cddb611ce300c565c1b9daa12d4ad8bb94197f8339b63d5a2869
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 'https://ttraff.cc/wix?keyword=metodos+estandares+y+dise%25C3%25B1o+del+trab'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a malicious link within the document.

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.cc/wix?keyword=metodos+estandares+y+dise%25C3%25B1o+del+trab
    • https://static.usrfiles.com/ugd/df4650_fcf804f15fd040789079b4b13dc58a4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_72dca2aab43849c2831309232ee23de5.pdf
    • https://static.usrfiles.com/ugd/0f5b72_d0317b86fd1143eeb3dacc21282e9821.pdf
    • https://static.usrfiles.com/ugd/fbccce_bfcf6a70abad4c33960d84d6d62b45d5.pdf
    • https://static.usrfiles.com/ugd/16a96a_97b88a79b87646da9692b0016decc819.pdf
    • https://static.usrfiles.com/ugd/c068f8_5350b0ca66e14f818a9d9e47fa4e7818.pdf
    • https://static.usrfiles.com/ugd/868401_46bc46adc1be4929b8d5eb048aa6b117.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/jowuzufufafibira.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/mathematical_statistics_bickel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4982/0065/files/70125376238.pdf
    • https://cdn.shopify.com/s/files/1/0435/0282/9734/files/zovofaziwibibujoko.pdf
    • https://cdn.shopify.com/s/files/1/0429/8765/1235/files/womoj.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_d8f5f24f4a68463a985a6d1072605353.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e91c8ffad224240b9b6ae6b2fc36491.pdf
    • https://static.usrfiles.com/ugd/2e16aa_3769c5df449f483a8729cfc355dff8a5.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_off00005bb4.bin
3ae49c236187e7fb75f4906927fb57ee9d85f73c642e4868235d061d92407cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB4 5280 bytes
font_01_sfnt_off00006d75.bin
2a26abbac707dc6f4eeb7711408ab9ad2af99f822f6c4b4c8117e0ae87b3adb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D75 11272 bytes

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