Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d58a4997eb389b…

MALICIOUS

PDF

34.0 KB Created: 2020-08-19 16:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aede8cc9c6460f9d0427f50922026ec5 SHA-1: cadd9a670f70cbf4724f75e439d5f56151e682cd SHA-256: 83d58a4997eb389b8807e336ef3e30f70da2352c1da6c7560eb286dc0d3608f0
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous external links. One of these links, 'https://ttraff.cc/pify?keyword=evolutionistically+yours+sheet', is identified as a malicious redirector. The presence of a large number of links, many pointing to Shopify domains but ultimately leading to a malicious redirector, suggests a social engineering tactic to lure users to malicious content.

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=evolutionistically+yours+sheet
    • http://rezof.njwrclub.org/uploads/1/3/1/4/131437792/8224767.pdf
    • https://cdn.shopify.com/s/files/1/0435/4595/2408/files/standard_costing_and_variance_analysis_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/21110660264.pdf
    • https://cdn.shopify.com/s/files/1/0438/4869/5958/files/4042481155.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/ctet_answer_key_december_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0455/6609/9621/files/32887026584.pdf
    • https://cdn.shopify.com/s/files/1/0437/7896/5656/files/57353172842.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/convert_wav_to_flac.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/this_bright_egg_has_a_warm_shell.pdf
    • https://cdn.shopify.com/s/files/1/0439/9081/0782/files/whatsapp_iphone_6_plus.pdf
    • https://cdn.shopify.com/s/files/1/0436/2335/0434/files/61410060562.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_off00004504.bin
a4f7a21b0c75ae9a01e9b5f8ecadc1836f27286b903964b05dce34eb11a0b854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4504 5008 bytes
font_01_sfnt_off00005614.bin
dd335ff69bf2733c875bcd184c875ed29c80553d7a9c5ed1775e3f00b205392e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5614 11152 bytes

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