Malicious PDF — malware analysis report

Static analysis result for SHA-256 419515b1da3aa05a…

MALICIOUS

PDF

38.5 KB Created: 2020-08-10 16:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 661e2a9123cd38e20d06f552080288d0 SHA-1: 3b002436892540404c4ab44fe02097195662374d SHA-256: 419515b1da3aa05ac074eaa27c3ca70690b18d9a4f955c7ce5c05d8825c3d4cd
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, many of which point to external PDF files hosted on various domains, including a link farm detected by heuristics. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which likely serves as the initial stage for delivering a malicious payload. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=funcion+exocrina+del+pancreas+pdf', suggesting a lure related to a pancreas function document.

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.cc/pify?keyword=funcion+exocrina+del+pancreas+pdf
    • http://files.keanoraubun.com/uploads/1/3/1/6/131637014/pepelumerif.pdf
    • http://files.instantcleaningservice.com/uploads/1/3/0/8/130874582/4811756.pdf
    • http://files.ericgamalinda.com/uploads/1/3/0/8/130874284/wagamekamizili-tumukibu-rafufebuj-wotan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevimofurerofujasopam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/24972796391.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/66852076270.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2753/files/pumis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4492/9690/files/31571318202.pdf
    • https://cdn.shopify.com/s/files/1/0429/5553/8591/files/joint_commission_international_accreditation.pdf
    • https://cdn.shopify.com/s/files/1/0434/2792/2076/files/78970020498.pdf
    • https://cdn.shopify.com/s/files/1/0436/0945/6803/files/95012896833.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/78148284940.pdf
    • https://cdn.shopify.com/s/files/1/0431/0492/7905/files/10653222920.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3982/files/academic_writing_task_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/adobe_photoshop_cc_2020_full_tutorial.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_off0000595e.bin
b2c03c9b2c1f30da3a7292d61f76254b3556a963d66273b2ca4c5688740dfb5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x595E 5172 bytes
font_01_sfnt_off00006b00.bin
6bb6816da9d5be468ea3506288ee989faf66c24e7a0b0b515bdeab725fd5745e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B00 10048 bytes

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