Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ce67e66963b27c…

MALICIOUS

PDF

69.2 KB Created: 2020-08-09 08:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815db148a2e72c416ef6f6a0a52b1127 SHA-1: 041bb213f483de1d643f5ccdcbd8e066cbcb3ac3 SHA-256: 61ce67e66963b27c5874222d8204b4d3e4272b8e9b6aff60de876fb20335cc4c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to external PDFs, suggesting a link farm or SEO manipulation tactic. One of these links, 'https://ttraff.ru/pify?keyword=black+body+radiation+short+note+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing the 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=black+body+radiation+short+note+pdf
    • http://files.scaretour.co.uk/uploads/1/3/0/7/130739713/7454599.pdf
    • http://runojolaw.edgertonwellness.com/uploads/1/3/0/8/130814328/6508971.pdf
    • http://files.thewarsoftherosescatalogue.com/uploads/1/3/0/7/130740211/f558ee.pdf
    • http://files.youcee.eu/uploads/1/3/0/7/130775151/zigib-vebatatubaka-kijabe.pdf
    • http://files.veresan.com/uploads/1/3/0/7/130776720/mokawerarajimaxose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/74277263128.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/defakokukimikolawofobisup.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/34281002695.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/xamixozusipu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/24196120997.pdf
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/bokixeduzu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/mathematics_form_1_questions_and_answers_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/gingivitis_asociada_a_placa_bacteriana.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1801/files/fopenixenuzivogifuvenago.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/96273846069.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6247/files/17229302435.pdf
    • https://cdn.shopify.com/s/files/1/0433/9836/5340/files/39857037068.pdf
    • https://cdn.shopify.com/s/files/1/0444/5034/9223/files/junkers_gas_calorimeter.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_off0000b176.bin
a11c0746bca5b624a61e13e7db155a433ff6cc97269e570737bc235a5ff58a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB176 5600 bytes
font_01_sfnt_off0000c482.bin
0c30637964417d732e03eb1533d1218bee43fd1e3e77321311a75107dcb14997		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC482 13816 bytes
font_02_sfnt_off0000f08f.bin
6bc0bded15e1533fd20b8803677197f18b49183b8e714809341b5151e399a600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 16512 bytes

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