Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93ae1fd6d94eca4…

MALICIOUS

PDF

45.5 KB Created: 2020-08-22 10:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbc584156796fc2e432d6881fd56223d SHA-1: 0076964e888b698b00615d57f11afa3068c2981e SHA-256: e93ae1fd6d94eca4a70314224b0882e36acefe4dd5cce25ed19dbda7dba2ae1f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign content, but one critical link directs to a known malicious redirector. The document body contains garbled text and a suspicious URL, suggesting a lure to a malicious site. The presence of multiple PDF links and a redirector indicates a likely attempt to drive traffic to malicious infrastructure.

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.ru/pify?keyword=cinema+4d+r20++mac
    • http://files.wilfredofalcon.com/uploads/1/3/0/7/130776542/5384946.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/never_be_alone_shawn_mendes_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/4334/8892/files/37071773432.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/81612604155.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6257/files/assam_university_pg_application_form_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/90974780246.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/dixututisusuxudimaruma.pdf
    • https://cdn.shopify.com/s/files/1/0445/5032/4388/files/student_attendance_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/83306078890.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062e4.bin
dd37e3b2e69b475230112c092720685e6976dbbceacf1aded9ddbc539e1fdd99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E4 4860 bytes
font_01_sfnt_off0000733e.bin
52f1bed4f80cfef48504e37649dd3b4cc5387560fcf9365742311ec0b06d4760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733E 12656 bytes
font_02_sfnt_off00009bba.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BBA 4324 bytes

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