Malicious PDF — malware analysis report

Static analysis result for SHA-256 8633421639bc6e60…

MALICIOUS

PDF

73.8 KB Created: 2020-08-22 07:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6570c30afeffb8836fe1f928ce6de3b9 SHA-1: 3f088119dff5cd0ff7603f0fdc61c401cafa4a15 SHA-256: 8633421639bc6e60a9fd27370cdd231d93e552cecf35ecf45d441871601715da
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying one as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Bollywood movie songs free 2017' and the malicious URL, suggesting a lure. The presence of embedded links and the ML classifier's high confidence score indicate malicious intent.

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=bollywood+movie+songs+free++2017
    • http://files.chezlapingoods.com/uploads/1/3/1/3/131381241/kulanig.pdf
    • http://gowabamer.walesbaptisttn.org/uploads/1/3/1/4/131438309/86e813eff650b8e.pdf
    • http://jupatu.southernschoolphotography.com/uploads/1/3/1/6/131636947/7254460.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/41317442891.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/diary_template_for_onenote.pdf
    • https://cdn.shopify.com/s/files/1/0439/1708/2792/files/6473464738.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/equality_now_annual_report_2016.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/52262999223.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/guridepugugaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7725/files/tekegulisiwuxebon.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/tuxepafelo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2351/3238/files/22134529961.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/cambridge_essential_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/culture_shock_esl_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/rowewulaxaragagobowu.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_off0000c053.bin
831bba2ff2cb06a79d62206c36c63e0dfbdcc098d9f5592dba122148c2c3adac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC053 5728 bytes
font_01_sfnt_off0000d3ef.bin
ff0b407307fd1ef50d326768dc57faab070dc55eb506f8651a477379fa3432f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 15680 bytes
font_02_sfnt_off00010456.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16164 bytes

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