Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd84c7cc3259b49…

MALICIOUS

PDF

45.1 KB Created: 2020-08-30 20:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a465afea7e1e62465e381b22913fb71 SHA-1: bd8b775568f8194631aaaee3de5642a2a0aaaf39 SHA-256: 4bd84c7cc3259b4936addbc735614445d63233a9ad2d9db5276504c3aa708891
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=mastering+javaserver+faces+2.+2+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The document body contains the same malicious URL and a benign-looking book title, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of the malicious URL and the link farm heuristic strongly indicate a phishing or malware distribution 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.ru/wix?keyword=mastering+javaserver+faces+2.+2+pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/nejowege.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/zuvojufobemoxisavonosu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/wuluvibidimafowufaveba.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/62065199513.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/dumatadajewitikilovekorew.pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/jakepuvasezig.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/83104639671.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/37990906578.pdf
    • https://cdn.shopify.com/s/files/1/0437/2076/9685/files/acta_constitutiva_sat.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/lebogivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3721/2319/files/etapas_del_metodo_global.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/formal_grievance_letter_bullying.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7563/files/fumapikivumun.pdf
    • https://cdn.shopify.com/s/files/1/0447/5482/9463/files/certified_ethical_hacker_ceh_v10.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/rifaxuvafovolatewugeza.pdf
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/17375716065.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/matriz_para_toma_de_decisiones_con_destreza.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_off0000705a.bin
043087abe543f8348ca2a12a414827b25e002ac58346190917cdb7142fe73609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705A 5596 bytes
font_01_sfnt_off0000838e.bin
a5141b3e33b1ad74d8164e8c44e371938ba20e8133a16d15517fad260de4bb09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838E 10560 bytes

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