Malicious PDF — malware analysis report

Static analysis result for SHA-256 e315d5c3c755f22b…

MALICIOUS

PDF

43.8 KB Created: 2020-08-13 00:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38987c364cb339e2803b926df2d5b47d SHA-1: 479cae7d925550859bf9d5342cce48c0d59884b2 SHA-256: e315d5c3c755f22b9f823ff52e93b164bdd84f549df5f7f7b2c147bae87b12a2
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain (ttraff.com). The document body, though obfuscated, suggests a lure related to 'grievance procedure steps pdf'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=grievance+procedure+steps+pdf
    • http://files.grapevineoasis.com/uploads/1/3/0/8/130814682/70f89b88.pdf
    • http://files.zbsbatmitzvah.com/uploads/1/3/0/8/130873783/jipijomak.pdf
    • http://files.brothernature.us/uploads/1/3/1/3/131379246/dipujejumaboxoza.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3493/files/81990493940.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/jutepenero.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/exception_handling_mechanism_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridojunewosinojep.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0741/files/letter_for_internship_request.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/fowojiwizosapalis.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/40099191192.pdf
    • https://cdn.shopify.com/s/files/1/0433/3296/0409/files/open_file_in_browser_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/doxasejajesizolagig.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/grammar_worksheet_for_high_school_pdf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d7.bin
3b4a0d5a5b6d56b3510d1acd862408b4646ea9b6d12d48fe9dbc18424dff991d
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D7 5088 bytes
font_01_sfnt_off00007336.bin
c9bd39f1e8fc12ca013f625f5b9533ba16491fab4bcc3bae7ca360c10bc7e57f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7336 9740 bytes
font_02_sfnt_off00009475.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9475 4324 bytes