Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7d5c5e591c0127…

MALICIOUS

PDF

40.2 KB Created: 2020-08-15 02:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a6eef2aad7ee1992e356120ec8238bf SHA-1: 45087efdf544420545a30c97ea0dd19154f74124 SHA-256: fd7d5c5e591c01278e39d4a143071b11c46ed9496dd747046133598cbf8b4780
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector to ttraff.cc, indicating a link farm or phishing lure. The document body, though malformed, contains the text 'Wiskunde basisvaardigheden pdf' and the URL, suggesting a social engineering pretext to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=wiskunde%20basisvaardigheden%20pdf
    • http://files.thevictualbar.com/uploads/1/3/1/3/131383771/bujenab_tavuzur.pdf
    • http://files.tindelltraining.com/uploads/1/3/2/6/132695258/neluweradomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9418/7933/files/40936464306.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/88969779520.pdf
    • https://cdn.shopify.com/s/files/1/0440/5706/7685/files/fikuzazirot.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/jawesadiratibopibulutafo.pdf
    • https://cdn.shopify.com/s/files/1/0461/3216/6824/files/pugunewosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/89358424046.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/mupero.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/jobewewavenifagubemaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/1020/1499/files/fitubukigotijuzapim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/vigumopiwesilebiben.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_off00005d76.bin
57be5497d350ca2772899405091e39d9f054a4924d0ad361ec336e69630584ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D76 5548 bytes
font_01_sfnt_off0000704e.bin
73dc03160e68d89fd87efa4917a701b228bd876b33441120867701e5112fdfa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704E 10612 bytes

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