Malicious PDF — malware analysis report

Static analysis result for SHA-256 db88e775a51f4471…

MALICIOUS

PDF

45.0 KB Created: 2020-08-09 14:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d414a880fd3b736d35bf202e37aae673 SHA-1: 7bc725ec29a0391546b1330daaac8e69d44823ae SHA-256: db88e775a51f44713c134f2af274570af18708af56f75d19879715a8c757bcca
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to a known malicious domain. The document body, though heavily obfuscated, contains references to 'Federal arbitration act usa pdf' and the malicious URL. This suggests the document is designed to lure users to malicious sites, likely for phishing or malware distribution.

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=federal+arbitration+act+usa+pdf
    • http://files.kentuckybyhorse.com/uploads/1/3/1/3/131379356/6788317.pdf
    • http://files.hollyncoletta.com/uploads/1/3/1/0/131070178/7214957.pdf
    • http://files.survivingmentalhealth.com/uploads/1/3/0/9/130968943/jidipanubuwilij-gipuwined-sedev-lelagap.pdf
    • http://files.burhanisawmills.com/uploads/1/3/2/6/132681796/dinufegup.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/fapirar.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/26465901095.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/xetixefixagarosed.pdf
    • https://cdn.shopify.com/s/files/1/0429/1864/1830/files/lemukunofale.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/wulizapam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bopeberovejaxurid.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/van_richten_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/54037384414.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/retujuwoxazogudivenute.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/32104292690.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_off0000718b.bin
f70f04a14617a243b2cb01fe5c9db5b54ff0d8434ef9b83b88c9693b4b559c87
pdf-font-stream PDF embedded font (sfnt) at offset 0x718B 5244 bytes
font_01_sfnt_off00008367.bin
ab7101bf9a60440571c19a21cb9359f87c97527ff7b6e89c1a43574a759d1a9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8367 10760 bytes