Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b8cfce209eb2e8…

MALICIOUS

PDF

35.5 KB Created: 2020-08-09 19:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f434c30a8fbec39a3417b6b28ae1615 SHA-1: a662d6a689acb5d4b2f85cea1d82c655af29fc88 SHA-256: e1b8cfce209eb2e8deacd9ec3aa613c742424295649acc213c6913a4ac82bb0d
120 Risk Score

Malware Insights

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

The PDF document contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains the string 'Zearn student workbook pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous Shopify URLs indicates an attempt to blend in with legitimate content while distributing the malicious payload.

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=zearn+student+workbook+pdf
    • http://files.nvhealthandfitness.co.uk/uploads/1/3/1/3/131382243/3cb8582f1.pdf
    • http://files.nudgetraining.com/uploads/1/3/0/7/130775520/3894153.pdf
    • http://files.craftedbylocals.com/uploads/1/3/0/7/130739697/0d2d744.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8266/files/21524171849.pdf
    • https://cdn.shopify.com/s/files/1/0437/3676/0485/files/derabitasinemajig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26160609228.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7207/files/rofowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/76704712768.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/5148145857.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/notitijuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2421/files/wogadawomomulotovivoge.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/21862051777.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/98549332260.pdf
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/types_of_addition_polymerization.pdf
    • https://cdn.shopify.com/s/files/1/0440/4543/5030/files/tvpad2_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5831/files/99887677560.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_off00004e6a.bin
386f4855d2c3de45b8a1bc5b3e7682b02fb9156badc05ae95078af258454f8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6A 5256 bytes
font_01_sfnt_off0000606d.bin
02327194575581e1aeb1fbfceabca81fefc3a2dc6bfb2b29b0c3174a0a6f21ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606D 9820 bytes

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