Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9371e8c0533d94a…

MALICIOUS

PDF

34.6 KB Created: 2020-08-17 10:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e3915aab8b4f2a45480aa43a2341f9b SHA-1: ae6134a6d806393685fb6d1432dc3f43cea232a7 SHA-256: d9371e8c0533d94af34af403801253750fda6836217815a03fb1fdb1a7d95625
120 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, pointing to 'https://ttraff.cc/pify?keyword=doubling+and+halving+worksheets+year+2'. This URL is presented within the document body, disguised as educational content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify-hosted PDFs. The primary malicious URL is the most critical IOC.

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=doubling+and+halving+worksheets+year+2
    • http://sodisa.excelbusinessintelligence.com/uploads/1/3/2/8/132814930/ac8751d2f3e26.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/dojinofu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/estudio_exploratorio_descriptivo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/7108039604.pdf
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/rifopololebololoxejal.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/kiwubekijopalipe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0840/files/tazibo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4962/2431/files/ziduso.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/flash_animation_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/98653401689.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/28531667833.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9518/files/44695797100.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/30790006891.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_off000047a9.bin
790b8458124637420613db61718cd3d896be11ae44d749ce7969ca3550c950af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47A9 5676 bytes
font_01_sfnt_off00005b05.bin
c103906bb0b14983d94db753ba5b80887a10627c17213fabb2d134f3bea46361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B05 10084 bytes

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