Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5f1fd3e9e3291b…

MALICIOUS

PDF

49.7 KB Created: 2020-08-19 22:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 690cff196dabc00e4d7920b16990a2c4 SHA-1: ba33b3c1f7d911c5cb1ec72e7cfd9e636fea8b26 SHA-256: 0b5f1fd3e9e3291b2517312aace6c95206b8515f7ca7c49120cf634b39214c58
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 pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=answers+for+close+up+pics+level+24', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, indicating a potential lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=answers+for+close+up+pics+level+24
    • http://lefaxo.perfectfixhandyman.com/uploads/1/3/0/7/130776065/vowarepel-gunos.pdf
    • http://files.westport.votersguide.info/uploads/1/3/1/4/131437037/kezuk_nizofolojujiliw.pdf
    • http://files.hfullerton.com/uploads/1/3/0/8/130874328/3109673.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8063/6821/files/58780177840.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kawovuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/85191398617.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/nobuvufisazibasutajalibub.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/mewevaxizib.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/bejamujaxotuwoj.pdf
    • https://cdn.shopify.com/s/files/1/0454/7280/9126/files/b._e._d_song_jacquees.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/25364865142.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/44409992128.pdf
    • https://cdn.shopify.com/s/files/1/0439/3949/6094/files/korulikolonigosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2821/files/10587534888.pdf
    • https://cdn.shopify.com/s/files/1/0434/7360/0678/files/sadezozejub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006af5.bin
2a1959fe9d51da15d0e22bb445fbdebbb0e8eae75156ef8ee0d5344d92c62197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF5 4964 bytes
font_01_sfnt_off00007bfc.bin
2d3a86a5f01509a98ed4233ebefe51e175ed628d146d555f3ac3c0a60f0261b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFC 14852 bytes
font_02_sfnt_off0000a9c6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C6 4324 bytes

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