Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a359a1ccc6a10d5…

MALICIOUS

PDF

34.8 KB Created: 2020-08-03 08:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38090c0505e1fb815ec36a36c0a8cc1a SHA-1: 239ec94cdcbdbb819807cd1a7519ad5d7080d6b8 SHA-256: 2a359a1ccc6a10d5199d075fe6b2e7d62a5f8c8bd6a390cbc4eaca8b5d53a3e6
152 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 pointing to other PDF files hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure malicious activity. One of these links, 'https://ttraff.cc/pify?keyword=bit.+ly%252F+2onbep4', redirects to known malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=bit.+ly%252F+2onbep4
    • http://files.morocco.ency-education.com/uploads/1/3/0/7/130738806/5847bdc.pdf
    • http://files.boondocksirishwolfhounds.com/uploads/1/3/1/3/131383826/8d21a64833d35.pdf
    • http://files.lovesocialcafe.com/uploads/1/3/0/9/130968992/zumidelukis.pdf
    • http://files.happyhealthymentalitee.com/uploads/1/3/0/7/130739443/2659999.pdf
    • http://jomij.jolenewright.com/uploads/1/3/0/8/130813765/samumof_wixafutubokoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9187/0375/files/43301860372.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/babagirezir.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/25294542097.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/pathfinder_mythic_adventures.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2773/files/86812502452.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/37462154996.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/sipexidonilaniferezebixok.pdf
    • https://cdn.shopify.com/s/files/1/0440/7066/6392/files/wrightsville_beach_water_temp.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/28060457784.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16481260084.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/10488527956.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_off00004ad9.bin
084d40201215c9ff63e8285ff001bebf8628121b1cf13dca153df7860c689044
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD9 4908 bytes
font_01_sfnt_off00005bc4.bin
ab15aaadb2ef2bfbb94c86e0315fe3cbd3829ed467203bf6e90a8acb04265fd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC4 11044 bytes