Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4d1d0b7e94854f…

MALICIOUS

PDF

46.8 KB Created: 2020-07-20 03:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3720677e4a8b8d064db47450569f3437 SHA-1: 66a6e0e896a631008ea0efcd4bf1169374095433 SHA-256: 0b4d1d0b7e94854f8ce6cd1e3fcf7c2d927845d9399841566acd67d2d369bc51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate PDF files hosted on Shopify. However, one of the primary links redirects to a known malicious domain, ttraff.ru, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=agilent%2054621a%20oscilloscope%20manual
    • http://files.navidbargrizan.com/uploads/1/3/1/6/131636988/zepugenonudu_zarizewipezaze.pdf
    • http://files.nathandmaki.com/uploads/1/3/0/8/130874009/jenunelabudaw_korezosuzedavew_loxuji.pdf
    • http://files.heritagefinancialnorth.com/uploads/1/3/1/4/131406701/8080993.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/62882247471.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7278/files/46298060496.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/26892244273.pdf
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/43911468855.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/moleg.pdf
    • https://jarojadum.files.wordpress.com/2020/06/32702235303.pdf
    • https://joradudusi29210920.files.wordpress.com/2020/07/vuzejol.pdf
    • https://sifuvuviluz.files.wordpress.com/2020/06/61898528317.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/40016785121.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/20990908009.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/penasaderonar.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/82380944577.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3406/files/toputufajixonemux.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/48855300188.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/baxotaguf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/xupemujukujedideralax.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/rabaxolidirulepobu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007826.bin
dc579a3a20a1a63cff0271c2c0fa7bfbb7ca6534b8eb174b7b7e4705909f46a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7826 5576 bytes
font_01_sfnt_off00008b17.bin
8a0f1023858c43e03144dab65da90c8af0cb59d41f74249077ba390f5b7aa35c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B17 10244 bytes

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