Malicious PDF — malware analysis report

Static analysis result for SHA-256 661fe87066c88f82…

MALICIOUS

PDF

41.4 KB Created: 2020-08-02 20:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f65b0aecd1c7837b892662391b3f435 SHA-1: 33e86a691ab8bf285edb24d9cde4481e60a3914a SHA-256: 661fe87066c88f828b36c6336a9fcd2cbabfa2c19eb3251a184426fbe3ce2a00
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=kenmore+washer+repair'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one to 'https://cdn.shopify.com/s/files/1/0431/2226/2178/files/mobesunovibo.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious 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.ru/pify?keyword=kenmore+washer+repair
    • http://files.minigardenexpress.com/uploads/1/3/1/3/131380569/2677072.pdf
    • http://files.alllandscapedata.net/uploads/1/3/1/4/131453406/60564a.pdf
    • http://files.momentsofgracewithmargaret.com/uploads/1/3/1/0/131069763/d368849d7.pdf
    • http://files.fear-to-faith.com/uploads/1/3/1/6/131637333/3414990.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/mobesunovibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/69296409150.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/36845650370.pdf
    • https://cdn.shopify.com/s/files/1/0436/6050/9337/files/83577667580.pdf
    • https://cdn.shopify.com/s/files/1/0430/6360/7445/files/xegegabewabusejakojisefur.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/20570471718.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/kosufujasadakexovuvadodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/994400056.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0792/files/skyward_alachua_county.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/54433373487.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0250/files/tusojikimise.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/japanese_drama_torrents.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_off000065a8.bin
5c56e18c3f1a5268dc5e398235ea3d8075c3da7341ea8fc4c5aba10bf0ed9600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A8 5088 bytes
font_01_sfnt_off000076dd.bin
60bb09883dd5bd539ac87357316f679cb6c732b92ed12875d4972e73f448a664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DD 9884 bytes

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