Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98229c4cbcd1372…

MALICIOUS

PDF

45.7 KB Created: 2020-08-22 02:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83ba78ad2968524553cb30154b392e40 SHA-1: 02d70e3426424fcb20e723238a15406c1ad3ae4d SHA-256: b98229c4cbcd13728183ab4dfc70c6454b0f948beee4f52a21774d1640debce1
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'interquartile range questions worksheet' and includes the malicious URL. The PDF_SEO_LINK_FARM heuristic also fired, suggesting the document is part of a link farm designed to manipulate search engine results, likely to distribute malicious content.

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=interquartile+range+questions+worksheet
    • http://files.lightstarcreations.com/uploads/1/3/1/1/131164414/bexukeramux_zifukinujesuzi_zebagawu.pdf
    • http://files.lifesparkz.net/uploads/1/3/2/6/132682030/jarur.pdf
    • http://rofoke.spartanhoops.org/uploads/1/3/0/8/130814448/7f6bf8dbf959a.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/paracetamol_poisoning_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0325/files/12398804566.pdf
    • https://cdn.shopify.com/s/files/1/0436/2996/9561/files/sojupirotudakup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42228357160.pdf
    • https://cdn.shopify.com/s/files/1/0445/3515/2804/files/cambridge_complete_pet_student_s_book_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3563/files/facebook_emojis_keyboard_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/autolesiones_en_adolescentes_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0433/9790/6589/files/dream_a_little_dream_of_me_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/disadvantages_of_using_technology_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/bmp_image_format_advantages.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_off00006d8b.bin
78428ee3e3db1adb967b1a2f2649129c8d6509fb063b555cb062639b068494b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8B 5164 bytes
font_01_sfnt_off00007f1f.bin
d4b4fbf7eee83efe1d9d6eeb65f4f12adeeee20691b2c7cb9b9cfc0bd99ab68d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1F 13232 bytes

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