Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c18798e9a95892…

MALICIOUS

PDF

38.2 KB Created: 2020-08-07 08:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a161669dc4d053f29ab355cdcf3a57f8 SHA-1: aeac83019056bb97ebea782ab4a93c7fb2b11ebe SHA-256: a9c18798e9a958929dcd5874e9b66f1644be59eb87f3a4c9abe45419ac48478e
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating a lure to external content. The embedded URL and document body text both point to a 'class diagram book pdf' lure. The primary malicious URL is ttraff.cc, which is known for redirecting to malicious sites. The document itself is generated by wkhtmltopdf, suggesting it was programmatically created for this purpose.

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/wb?keyword=class%20diagram%20book%20pdf
    • http://files.bayareaboatandhomeloans.com/uploads/1/3/1/3/131398059/3302143.pdf
    • http://files.jazzymaths.com/uploads/1/3/1/3/131382497/a23d68.pdf
    • http://files.holly-blue.com/uploads/1/3/0/8/130873903/jufav-memekeve.pdf
    • http://files.aboundinlove.com/uploads/1/3/1/0/131069869/nipumifabolej_wibuvupekefile.pdf
    • https://cdn.shopify.com/s/files/1/0430/3178/9721/files/zituwupik.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/8571390963.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/59554496318.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/59512291410.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/dulas.pdf
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/mathematics_for_economics_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/pajevimumetusawudoputewul.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/sefogesa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/69594169545.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/57007863034.pdf
    • https://cdn.shopify.com/s/files/1/0437/8473/2829/files/mesorudadezemupisimizusa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/moxufavoxemebinopegojivum.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/52532849053.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_off0000599b.bin
0ded2fc05efc89594508e1bcfe851de1f3e01a85dcdd8f4336ac105cf30b9862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x599B 5472 bytes
font_01_sfnt_off00006c18.bin
87bde20383209c2506f43ebc85c46830c556f65ebc5eb3a3ea5d701145638e47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C18 9432 bytes

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