Malicious PDF — malware analysis report

Static analysis result for SHA-256 4659207b4a7a20c8…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 14:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f50dbddaa0669ec70b8f78df14015b1 SHA-1: 838926279dbc87c2c355e6f594909216c4880cce SHA-256: 4659207b4a7a20c8074243c0d27c7744830a105c4903c9125b6dc4e95b775d22
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector URL. The document body, though heavily obfuscated, contains the primary malicious URL. This suggests a phishing or redirection attack aimed at leading users to malicious content. The ML classifier strongly indicated maliciousness, supporting this assessment.

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/wix?keyword=anagram+game+in+android+studio
    • https://cdn.shopify.com/s/files/1/0431/6525/3792/files/bates_physical_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9494/files/vacuna_neumococica.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/psychology_test_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/mofazidam.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/befuzidajojaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2201/files/time_tables_chart_1-1000.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/20306546850.pdf
    • https://cdn.shopify.com/s/files/1/0459/9139/5485/files/the_squat_challenge_free.pdf
    • https://static.usrfiles.com/ugd/12f4eb_94995fe241e24a7db2a79042017aa8b2.pdf
    • https://static.usrfiles.com/ugd/b7ed05_271255e596b34a82b3afba977d34ec8d.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_a2fb47f313414515b2dad947b7181e8a.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_4389b8a21dfa4d9391c397b578d7e472.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_off00006be6.bin
9b8c2ffc79817ea78ba8128b3665f5a1ac3b4e4d696cfde4e58c5329633b7b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE6 5104 bytes
font_01_sfnt_off00007d2a.bin
108501ca3f5bcfc14d1495c4fc58005e8eb714a1f60e0d592a0204ddb518abd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2A 10488 bytes

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