Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfa435bcbbdf7e3…

MALICIOUS

PDF

40.5 KB Created: 2020-08-28 14:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13b554cf5f7d1c4ad7688a8e4d3283d6 SHA-1: cc594fcd88fd8c589cf0fee1eb29f6b611d32327 SHA-256: 4cfa435bcbbdf7e345337868e515609f863c96cbe1fd1fa9546ec1536dd4be81
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.com'. Additionally, it 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 same redirector URL and a Shopify URL, suggesting these are the primary points of interest for the attacker.

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.com/pify?keyword=sesion+%25C3%25A9+uma+palavra+aguda+grave+ou
    • http://files.idiscoverpreschoolplus.com/uploads/1/3/2/6/132681517/2818f6a64.pdf
    • http://todup.english.coach-michael.com/uploads/1/3/0/8/130814328/vunuxoguvaw_piwiruzubiwil_pawibaw_bovavoxuro.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1671/files/xeverofuxatigigabuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/99305024348.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6192/files/kelebein_ryas_filmi_izle_tek_para.pdf
    • https://cdn.shopify.com/s/files/1/0437/1546/1285/files/vageligakureseke.pdf
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/lejotiredalozeduxeku.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/dozefekofuzijewemabege.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1160/files/anthrax_in_cattle.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/acl_reconstruction_rehab_exercises.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_off00005aaf.bin
e0e5c96729500ac4b18ac78dd3e37a46e92133df185f9dc8fd0014e3af9dda05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAF 5584 bytes
font_01_sfnt_off00006d49.bin
ad8f5905d83903bfe054a4fad8690cc09a609e06091787a934f07b49c24d8a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D49 12612 bytes

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