Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce20e3f84b7ebe07…

MALICIOUS

PDF

44.8 KB Created: 2020-07-31 09:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e4a5e7abf0238b04c6478c98563440 SHA-1: 2a858f96a7f5cc91276446c90e00c3e2130d5c65 SHA-256: ce20e3f84b7ebe0799b2acd00224f6b8112557f4e9790f2bd9410d16af13870f
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of external links, many hosted on cdn.shopify.com, likely for SEO manipulation or to obscure malicious destinations. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it's a PDF generated by wkhtmltopdf, and the title "Human virology pdf" is likely a lure.

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.com/pify?keyword=human+virology+pdf
    • http://files.greywackemeadows.com/uploads/1/3/1/4/131437967/87c904d989448bb.pdf
    • http://files.orsondeane.uk/uploads/1/3/0/7/130776573/2876430.pdf
    • http://files.food2fun.com/uploads/1/3/2/6/132681670/zorutegafip-zidekutemekude-logajajebixam.pdf
    • http://files.annegabriele.com/uploads/1/3/0/7/130739142/zujuvis.pdf
    • http://files.annegabriele
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/29766876515.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/82790311502.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/puzexet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2500557594.pdf
    • https://cdn.shopify.com/s/files/1/0432/4596/1383/files/77330382019.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vizinedidobirefeguj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0487/0305/files/82556897306.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/bopabixokapodugawer.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/zogoxosexewozabe.pdf
    • https://cdn.shopify.com/s/files/1/0436/6319/6310/files/tagesuzibigokafivi.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_off000072c0.bin
a46300fad10bbb9a2fabdfc8612520df314bc14718694d3c71583bac32208320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C0 4988 bytes
font_01_sfnt_off00008398.bin
7a9c09a8f3d94e9b96ce1bde52ea3059f50dfa84908b8131002c67f217b2b850		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8398 10192 bytes

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