Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa6ac118a2f84a7…

MALICIOUS

PDF

39.4 KB Created: 2020-08-29 16:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17485ee8f828572af28622cf1804b4a8 SHA-1: 276a33f96f0c1125e868ad783f053e139248a2f0 SHA-256: cfa6ac118a2f84a7f78981cfb88de75d1f48351e1e02949570edd515bca68a06
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/wix?keyword=pickaxe+power+terraria as malicious. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector is a strong indicator of a phishing or malware delivery attempt.

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=pickaxe+power+terraria
    • https://cdn.shopify.com/s/files/1/0433/7532/9445/files/3d_analyzer_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/2156961900.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/canada_map_printable.pdf
    • https://cdn.shopify.com/s/files/1/0433/8227/6250/files/ontario_grade_12_english_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/agilent_33500b_arbitrary_function_generator_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/6300469563.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/36287767343.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4317/files/sefton_lscb_annual_report.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca084c4f7b0541d7baabb864e8fe120d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f6f58cfee424e95ae9ed891783f35a6.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_off00005dd0.bin
570281d5a6ea0e9e35c141a6c48eb0d41ae524b7e975791e2c19f834f080f717
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD0 4940 bytes
font_01_sfnt_off00006ebc.bin
cbd66349d64f3ca9aa14e8b466197b4d57912c9fbe764fe34fb7546dfab4225d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBC 10108 bytes