Malicious PDF — malware analysis report

Static analysis result for SHA-256 213b2f2473771a53…

MALICIOUS

PDF

47.1 KB Created: 2020-08-17 11:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5a43a9380e9a47d2b744b18f41be21 SHA-1: 6bcd4a32d44f7ab980dd5e73f34046c7339861a2 SHA-256: 213b2f2473771a53907e93afa1e2fc24252327f72b698f87aad7ef39bb82842a
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as medical treatment guidelines. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The document body itself is heavily obfuscated but contains the malicious URL.

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=acute+otitis+media+treatment+guidelines+2017
    • http://files.cherylanncooke.com/uploads/1/3/1/3/131380848/6a9d946fe.pdf
    • http://files.hardwaresolutions-la.com/uploads/1/3/0/9/130968920/jakobedigepowi-winolu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5341/4565/files/bibox.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9163/files/99068672827.pdf
    • https://cdn.shopify.com/s/files/1/0431/5090/1402/files/48849243056.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/tarototejox.pdf
    • https://cdn.shopify.com/s/files/1/0454/2342/7752/files/vakujubovomagexewifumur.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/maternity_leave_form_for_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/64138071925.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3586/files/gezezozapitumigiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/gijazekosezipitowofow.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_off000078e7.bin
82357cea58cc2c971600798775cd5b606d0cb9717dcdd6e2802180d0f196263b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E7 5656 bytes
font_01_sfnt_off00008c08.bin
238532a89adaa8c3baa275f4edbb1994f8ffa49045c2115f4c44ee752b257a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C08 10452 bytes

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