Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec62adf06e99a153…

MALICIOUS

PDF

40.7 KB Created: 2020-09-01 18:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03755f245f5b15356e5b13cc766a5f9b SHA-1: 29d5f36b18cf68da7a7ae66940973d5ee78cb3f6 SHA-256: ec62adf06e99a153e9670e9a8d454cadce20234e5816ba1325e76df9589db9f0
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, which points to 'https://ttraff.cc/wix?keyword=estimation+worksheet+1st+grade'. This URL is presented within the document body, disguised as an estimation worksheet for first graders. The PDF also contains a link farm heuristic, indicating a large number of external links, many of which point to Shopify domains hosting other PDFs. The ML classifier strongly flags 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/wix?keyword=estimation+worksheet+1st+grade
    • https://cdn.shopify.com/s/files/1/0433/7818/0259/files/42517582780.pdf
    • https://cdn.shopify.com/s/files/1/0439/4336/2715/files/25954827742.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/afpa_cantin_formation_chauffeur_de_bus.pdf
    • https://cdn.shopify.com/s/files/1/0439/7016/6942/files/nibowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/pirozipasoripaselizev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/lumezusuvipelope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejupabofutub.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5211/files/795700343.pdf
    • https://static.usrfiles.com/ugd/73cb9e_bc75d8cd165247fbb29e4a44df79fd53.pdf
    • https://static.usrfiles.com/ugd/e2b09b_fecd0247adc54559a294f667c9b9a129.pdf
    • https://static.usrfiles.com/ugd/838e7e_f17e3ccf3e5e4e0ea5b1c9ae2cc0fa85.pdf
    • https://static.usrfiles.com/ugd/74147a_6404bd42480f473d89a57e7fe5ed3968.pdf
    • https://static.usrfiles.com/ugd/834936_d53b088dbcb44d78aeb2f037b66c680c.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_off000061e3.bin
c87c8feeb18d301b37888fe982c0d9d9e66490a492a52f7e4e39b286d9a2f41a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E3 5372 bytes
font_01_sfnt_off00007416.bin
fcd05cde6993ab85b37f1f1f947cc1d30f6e1995d8930087a4f6258c70b177a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7416 10052 bytes

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