Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae53340be5989af…

MALICIOUS

PDF

46.0 KB Created: 2020-08-06 13:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f89994f17b8b285efab0893ec7ada93f SHA-1: 7fd2f52d7ce0eb4927d21974d2fd0320aa511ee3 SHA-256: 7ae53340be5989af585efac028b6868224532702af391a99df8ebeb81ad4cc33
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a redirector to a known malicious URL. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting an attempt to lure users to a potentially harmful site for phishing or malware delivery.

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.cc/pify?keyword=defectos+del+tubo+neural+genetica+pdf
    • http://files.midmichigansingers.com/uploads/1/3/1/8/131856398/6334186.pdf
    • http://files.management-star-class.com/uploads/1/3/1/4/131453198/b879ac6ab4f9.pdf
    • http://files.akashicranch.com/uploads/1/3/2/7/132740905/velejibilodulud_vemaruwojux.pdf
    • http://files.shureepiano.com/uploads/1/3/0/9/130969097/zepofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/gipoxagudaduwinewosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/46874693526.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/fuliparevuzegu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5258/files/amelia_island_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/1711/7601/files/concepto_de_anabolismo_y_catabolismo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/xalediwonupogebali.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/tanavetifavixuwavor.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/kajasowopiruwisoki.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/sudasewukikofejuvaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/palebonabojupuwomebeda.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/gugomif.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5243/files/18719761682.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072b5.bin
808fa011fc75f417c2960dd022aa5a56d74028ab0cba473091e080aa9d8906b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B5 5464 bytes
font_01_sfnt_off0000855a.bin
aba26db4c15692a9b01eeaafdd68a35afe690c3643b99ef648802be6e66654f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x855A 10832 bytes

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