Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8155cd26362928…

MALICIOUS

PDF

39.1 KB Created: 2020-08-31 03:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18e2747e97a2714c57f45aeff80cabe6 SHA-1: 15d01117602be4ee81f647f1285ee3aedf5e2f48 SHA-256: bc8155cd263629280b618160b365715adf9aee629149cb5ab612ce8bd2c0de11
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a likely phishing or malware distribution attempt. The presence of a large number of external PDF links suggests a link farm SEO tactic to obscure the malicious destination. No scripts were extracted from this sample, and the document body is heavily obfuscated, but the primary malicious indicator is the redirector 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.com/wix?keyword=rosario+al+ni%2525C3%2525B1o+dios+completo
    • https://cdn.shopify.com/s/files/1/0440/7063/3624/files/wozivedapevum.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/vosinowiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1470/1735/files/celebrate_recovery.pdf
    • https://cdn.shopify.com/s/files/1/0434/1976/2855/files/sixth_grade_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/pitiminenazawesiworoliv.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b11ea4168fc46ce8afb8c06bea4c229.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4a94a6ddf6d452cbc41c039b8f8e669.pdf
    • https://static.usrfiles.com/ugd/4b874d_31094673e7a64ab2ae2555717f88d2f1.pdf
    • https://cdn.shopify.com/s/files/1/0436/8806/7225/files/63530607562.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/vigeruvarubutebaroriwa.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_off00005953.bin
a1ec0d5d4467286e1b278cbfb703cb0fdf820c00d89ef040a26fcd6727ebabaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5953 5436 bytes
font_01_sfnt_off00006b6e.bin
560c1f42e7393b2b41104c68f77314a686987acf7b78c2f5f2a842d1254cba3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6E 10296 bytes

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