Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1f7b9566709a59…

MALICIOUS

PDF

48.0 KB Created: 2020-08-23 04:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 721d04ee6aa739ea3d06e8ddde4b81b8 SHA-1: 1ca1829aff440d29191afd7211c29bae4e743d16 SHA-256: 7a1f7b9566709a5948bb58130fb7f1ff85b4722aff3bbc30a1fe8786304cb9a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm and another flagging a redirector to malicious infrastructure. The primary malicious URL is ttraff.ru, which is likely used to obscure the final destination. The document body contains garbled text and embedded URLs, suggesting an attempt to disguise its malicious nature.

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=kambikuttan+pdf+malayalam
    • http://wigonifap.beevoice.net/uploads/1/3/0/8/130813117/84c2afb0c7e9eb2.pdf
    • http://bivuka.effectivemortgage.com/uploads/1/3/2/7/132740214/397d48a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/5th_grade_math_worksheets_free.pdf
    • https://cdn.shopify.com/s/files/1/0449/8066/6526/files/royal_imaging_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/ethnography_and_ethnology.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/64771801033.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5458/files/fipuvipewoxapolabotuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/64966757070.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/cribbage_against_jake.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/satexena.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/44304035763.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/natevibepoxubijixefuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/2388/4711/files/rafasabaluvexojojizefaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/0667/2546/files/best_hikashop_template.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
    • https://gitlab.com/smc/meera/blob/master/COPYING
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e8b.bin
00c6847bf2d96944831bd239f21b3a8097ee6a4470c21e74df0834d6c6620b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8B 5188 bytes
font_01_sfnt_off00006024.bin
1a43d9a076844feee33979a37de7e5016da9d8601a5b65d698bf754e69687e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6024 3840 bytes
font_02_sfnt_off00006f04.bin
1a016887f149332441d4d0c4542b56534dae5f8948f5d1ceb8e3b6d611d03e36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F04 10380 bytes
font_03_sfnt_off000092ca.bin
21c97f68dbb86cd5de1ff9a98310495377a443c8fc79496dec240d14fbf1b666		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92CA 19060 bytes

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