Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db9d729d71bb1ce…

MALICIOUS

PDF

51.1 KB Created: 2020-08-15 00:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8961d7f4ae8e82713b62e7b574d58ea SHA-1: cfc042b20a2a3fd618c84270f1455b40b92ff1ca SHA-256: 8db9d729d71bb1ce7868b9b72f1544778a7df1056c73d103344a32a1198ec79a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL and keywords suggesting a lure for content related to 'Ben 10 alien force emuparadise'. No scripts were extracted, and the primary malicious activity appears to be redirection to a harmful site.

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=ben+10+alien+force++emuparadise
    • http://files.thenecsl.com/uploads/1/3/1/3/131398113/786524.pdf
    • http://files.davidll.com/uploads/1/3/1/8/131871745/7775834.pdf
    • http://rozab.goodshepherdschoolgss.com/uploads/1/3/1/4/131409200/bbacce7b99f6143.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/xufizakovovol.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0955/files/statistical_quality_control_solution_manual_6th_edition_montgomery.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/45933831047.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9755/files/56477692520.pdf
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/as_time_goes_by_easy_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/anthropological_theories_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/just_host_webmail.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1400/files/fusionner_plusieurs_document.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/
    • https://cdn.shopify.com/s/files/1/0435/8062/0955/files/statistical_quality_control_solution_manual_6th_edition_montgo

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080c4.bin
2219dd791e9d45c8fe63b1db5bf0c1cdb8b85ecef1016eba0ecf5cb89c491330
pdf-font-stream PDF embedded font (sfnt) at offset 0x80C4 5544 bytes
font_01_sfnt_off00009383.bin
43c958d79594d3c47f1c714fd93f65cd813092afa58467576762936004c0113a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9383 14092 bytes