Malicious PDF — malware analysis report

Static analysis result for SHA-256 d123bfbf1404b548…

MALICIOUS

PDF

38.4 KB Created: 2020-08-21 00:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8222be6ddc8068ee3eed41bc23bb576 SHA-1: 19deb16a6a27e9be6284d7d7fa9df2f958d35887 SHA-256: d123bfbf1404b548fd831580ebc865fcd4d5be40fab54f91d63dc102a4098cf9
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/pify?keyword=headway+beginner+workbook+answers`. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking PDF title, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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=headway+beginner+workbook+answers
    • http://files.gladwinfmc.org/uploads/1/3/1/3/131383838/komeveroju.pdf
    • https://cdn.shopify.com/s/files/1/0434/4460/0999/files/candlestick_explained.pdf
    • https://cdn.shopify.com/s/files/1/0440/3236/0613/files/mekezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/accounting_and_finance_an_introduction_eddie_mclaney.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/fukotirowuradakosoweduva.pdf
    • https://cdn.shopify.com/s/files/1/0431/8596/3168/files/nosezagipid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/moxovabozakumoburi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/pepigexaresaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3825/files/chemistry_textbook_grade_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/64520370467.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/26256216093.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/62200298193.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/proyecto_de_investigacion_sobre_el_bullying_escolar.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_off00005734.bin
c4de6e389e5cf168ffbe4f3554784456b410e646b80677350a9418d0525b96a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5734 5320 bytes
font_01_sfnt_off00006966.bin
4fa622abb0936aeb9c2305158d5f341964a2f44bea606563272fa69b0c288db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6966 10352 bytes

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