Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f5f28681c24682…

MALICIOUS

PDF

46.6 KB Created: 2020-08-03 13:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e33d4fcadebe6bba09dc7c7a4d34dd6 SHA-1: f8806ceddb6ea73a76a452cea5ae024ec170fb26 SHA-256: 19f5f28681c246825ff7cde9bdd029579b403a1a705d5735bff07ed02f79b843
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=keystroke+dynamics+as+a+biometric+for+authentication+pdf'. This URL is presented within the document body, disguised as a research paper title. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on shopify.com. The ML classifier strongly indicates maliciousness.

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/pify?keyword=keystroke+dynamics+as+a+biometric+for+authentication+pdf
    • http://files.ultimatesourceoflove.com/uploads/1/3/0/7/130739564/8284447.pdf
    • http://files.lisaworkman.com/uploads/1/3/1/0/131071145/50420c449e.pdf
    • http://files.adamtierneyeliot.net/uploads/1/3/0/7/130775432/b3b5a.pdf
    • http://files.adamtiern
    • https://cdn.shopify.com/s/files/1/0433/4908/2264/files/zasesivobebazovebure.pdf
    • https://cdn.shopify.com/s/files/1/0433/0471/4404/files/pijesigevetugukomob.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/penanulikuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/xedowunezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4839/files/96148719725.pdf
    • https://cdn.shopify.com/s/files/1/0436/6447/4262/files/bedufepoxuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/44347301257.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6301/files/72152743419.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/89061612225.pdf
    • https://cdn.shopify.com/s/files/1/0441/3505/5512/files/desapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0434/0636/0730/files/rukijepitilodajelewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/1646122189.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_off00007729.bin
85ad3b751dea2f8810dacfd5b7290db22d79dcf78b096115387163a30c293581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7729 5640 bytes
font_01_sfnt_off00008a31.bin
4f1751e35d81015c31e626669d4112a97227ab99169b44ae056d72ad275ba94d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A31 10096 bytes

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