Malicious PDF — malware analysis report

Static analysis result for SHA-256 15705b61e54f65e6…

MALICIOUS

PDF

48.6 KB Created: 2020-08-09 14:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4de5b85d99868daa05fe0ebe836875ff SHA-1: 68b80e9f22bccfc28a4f06266afa4349cba04e8e SHA-256: 15705b61e54f65e620db7981d83fa49b26907c098c3b856708dbbcc726dd8231
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains the same lure text and the malicious URL, suggesting an attempt to trick users into clicking through to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=get+ielts+band+9+academic+writing+task+2+pdf
    • http://files.harrisvillenatureclub.com/uploads/1/3/2/6/132696280/8713339.pdf
    • http://files.wingwoodfarm.com/uploads/1/3/1/4/131407164/wagigugodojas-powujiputafonu.pdf
    • http://files.thechilitrail.com/uploads/1/3/2/7/132741476/9444799.pdf
    • http://files.apartmentstenerife.ie/uploads/1/3/1/1/131164152/dipevugif_fexuzodexujuta_kexifezuzawadup.pdf
    • http://delafetu.freeyourmindaz.com/uploads/1/3/1/1/131164250/rugizi_wekoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2838/8772/files/square_root_of_65.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/51885882163.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8360/files/forbidden_woods_map_bloodborne.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/fatulopunuzu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2547/1400/files/50578419864.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/24689843437.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/butler_volmer_equation_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83390791822.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/phn_mm_chuyn_t_file_sang_file_nh.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/96322668486.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6667/files/jacquees_me_patron_and_you.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59677855830.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645f.bin
17501a81bc91fdd7b0641587245a4f3af50ee90f134da4dfeb4f6d9dcf88987f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645F 6088 bytes
font_01_sfnt_off0000791a.bin
7d70e0431965c3b9c445945b369157b2a744ba03c5c291200b5496b9ce714cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791A 11296 bytes
font_02_sfnt_off00009e14.bin
4d0b7fceb6e0b8544dba10d314310d86ee7e0ac375a8e3b5fd915ca5fa71995c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E14 16448 bytes

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