Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dfc2d31ed6500e…

MALICIOUS

PDF

65.9 KB Created: 2020-09-20 16:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14309de98a78c232ce61f911851fbe30 SHA-1: 74541e091f5e0a92442af6947501f56c86e276db SHA-256: c4dfc2d31ed6500e11c5ddde7285d890a36d08970c0b83ed323fcc173172f548
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=grey+anatomy+a+hard+day%2527s+night+script+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including 'https://cdn.shopify.com/s/files/1/0432/5313/7576/files/pifomudo.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the lure.

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.link/wix?keyword=grey+anatomy+a+hard+day%2527s+night+script+pdf
    • http://files.cosmexmelbourne.com/uploads/1/3/0/8/130813317/dovejukutupur.pdf
    • http://files.authoraprilkelley.com/uploads/1/3/2/6/132695491/negekuguruxetu_rajala.pdf
    • http://files.eyelikegallery.com/uploads/1/3/0/8/130873804/a9790.pdf
    • http://files.tawazonspace.com/uploads/1/3/1/8/131871984/ca4c6c690f3e.pdf
    • http://files.thevirginiaashpub.co.uk/uploads/1/3/0/7/130739470/832712a7.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/pifomudo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1019/4582/files/autocad_2020_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6779/1765/files/37684390576.pdf
    • https://cdn.shopify.com/s/files/1/0439/6616/9246/files/kexufapejatapodofuwom.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/gufupesazuramuwabeloroti.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_off0000c42b.bin
8abdfa7e83c1caa884f299740f04da46016ca8d7649f63d7fbe08e210a0453e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC42B 5704 bytes
font_01_sfnt_off0000d789.bin
ef9bfad444a40680b42b93d580a5ed17886a4365ab1e1f88462f6b6c1afb48be
pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 10308 bytes