Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df9c352dc12c271…

MALICIOUS

PDF

44.2 KB Created: 2020-08-03 15:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fd7c35ea578a9fe814bf65a94178d52 SHA-1: 6e68282c74fb85842c4fba067e8f9f5e24c6ebf5 SHA-256: 8df9c352dc12c271bfe1c6dc592a35b0332999e49b779bcf580ae675a3fb616b
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO link farms or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=english+suffixes+exercises+pdf'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to drive traffic to this malicious redirector.

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=english+suffixes+exercises+pdf
    • http://files.theaanh.org/uploads/1/3/1/4/131482930/nipagiveb.pdf
    • http://files.caribbeanfusion.co.uk/uploads/1/3/1/0/131070718/a5ba96b2c4d.pdf
    • http://files.nigerianwriters.info/uploads/1/3/0/7/130775011/tonasov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/bundesliga_spielplan_schalke.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/fakavaxuzanepodine.pdf
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/76082699816.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0776/files/45513999843.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/98779401759.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/nusufowaberatuforobar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3457/files/94010657760.pdf
    • https://cdn.shopify.com/s/files/1/0439/3769/3851/files/sea_ray_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/4195/6775/files/saxon_math_course_1_solutions_manual.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_off00006e63.bin
9e952e220c0b35055140f1684eceedd04512c276a91971866df67f63d61b2c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E63 5232 bytes
font_01_sfnt_off0000803c.bin
c601d1adeec07220f2c626b276f8de176ba6be84ddc6f680c9b8c59e999423f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803C 10376 bytes

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