Malicious PDF — malware analysis report

Static analysis result for SHA-256 522a2aa9f0a17362…

MALICIOUS

PDF

39.8 KB Created: 2020-08-05 23:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b43b0708975ebccef3f8c8e6a37b0fd SHA-1: 1a98be2ecc393d9066648f2463280384cee9b670 SHA-256: 522a2aa9f0a1736274d0586224424592d9c18768ae407caa87bc11bc08425585
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 PDF files hosted on Shopify. One critical heuristic firing indicates that the document links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=aptitude+exam+papers+pdf'. This suggests the document is designed to redirect users to malicious sites under the guise of providing exam papers.

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.ru/pify?keyword=aptitude+exam+papers+pdf
    • http://files.icttg.com/uploads/1/3/0/8/130814205/7126333.pdf
    • http://files.phillipsmathandphysics.com/uploads/1/3/1/3/131398362/rapubusalawif-potikoratum-gakada-kibamopivasigev.pdf
    • http://files.naturalenvironments.net/uploads/1/3/1/8/131860787/kegidimeg.pdf
    • http://fexuf.isawiitch.com/uploads/1/3/1/1/131164243/gagixaset-fepumowe-janiwitifutuwiw-pabexu.pdf
    • http://files.iowarabbitrescue.org/uploads/1/3/1/6/131606697/6347786.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/nipixiliwuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwisosipopiwusanitilowaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/60722404544.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/thematic_apperception_test_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/25770793485.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/83597436887.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/resisukejix.pdf
    • https://cdn.shopify.com/s/files/1/0444/3871/6583/files/meiosis_1_and_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/wiponiza.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_off00005d2f.bin
39231dfd6ccad32023248993b534f849c9048da86671929f9438b28b5713112b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2F 5212 bytes
font_01_sfnt_off00006edd.bin
a338c63a98d981237d63518d9077a5450c9626defa424a41056e1015a045ddc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDD 10588 bytes

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