Malicious PDF — malware analysis report

Static analysis result for SHA-256 3135e1011584e0fa…

MALICIOUS

PDF

53.1 KB Created: 2020-08-11 16:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 897b36498bc0d2d6ed5b8ddbb75695ac SHA-1: 0d77192dbdec23db9231b9b707e52dedc4fd4917 SHA-256: 3135e1011584e0fa77f5b3a81da78e99ca17b41742b4188e0a1f29779748df58
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=algebraic+expressions+class+7+worksheet+pdf'. This suggests the document is designed to redirect users to potentially harmful websites under the guise of providing educational content. The presence of numerous Shopify links, while many are confirmed benign, contributes to a link farm strategy.

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=algebraic+expressions+class+7+worksheet+pdf
    • http://tibejon.awananet.org/uploads/1/3/0/8/130873826/pevigufupon.pdf
    • http://files.fulfordelementarymusic.net/uploads/1/3/1/1/131164428/1054318.pdf
    • http://raboji.fit4fun13.com/uploads/1/3/0/8/130814328/635225.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/84353922872.pdf
    • https://cdn.shopify.com/s/files/1/0428/5592/3878/files/pdf_fillable_certificate_of_completion.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0595/files/rixowukamutijusidom.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/dugomope.pdf
    • https://cdn.shopify.com/s/files/1/0433/2008/2590/files/muwezejixekugixiwurure.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/20330161328.pdf
    • https://cdn.shopify.com/s/files/1/0439/1826/2427/files/86229361722.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/xazepefelifazaluwexen.pdf
    • https://cdn.shopify.com/s/files/1/0435/2301/4824/files/download_pangu_9._2.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/semakumoxowojipodoxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/wewopebobijipugaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/phonics_activity_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/75944539343.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/lenamekudeza.pdf
    • https://cdn.shopify.com/s/files/1/0437/2214/5943/files/va_forms_10_2850a.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_off00008753.bin
8c04495d8c70fa3faf432a1545e7d4f8bd93334f0b780543d9fa1bceeb76c226
pdf-font-stream PDF embedded font (sfnt) at offset 0x8753 5848 bytes
font_01_sfnt_off00009b4e.bin
40c300a6411a103cf23d8a540c89c506329f814d0dc0ac9e25b41133049604f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4E 13824 bytes