Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ba8c634fa70c5b…

MALICIOUS

PDF

50.4 KB Created: 2020-08-29 13:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6462fcf1ebc1adab23601da51736c1c9 SHA-1: fcd2c50ef4e4c91038adfa84630d0fe323c10f2b SHA-256: 62ba8c634fa70c5bcd9499053be23e4f5d1566c16a9c959ca4a7b63bba889c6d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Tubemate download 2.2.5', directing the user to the malicious URL. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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/wix?keyword=tubemate+download+2.2.5
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1497/9737/files/97067609401.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/antonio_candido.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/zovixubadatowo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/sefaxamekulibesiziv.pdf
    • https://cdn.shopify.com/s/files/1/0435/7816/3363/files/kuxekobir.pdf
    • https://cdn.shopify.com/s/files/1/0431/0450/1922/files/udp_tracker._openbittorrent._com_80.pdf
    • https://cdn.shopify.com/s/files/1/0438/3680/1181/files/97690930324.pdf
    • https://cdn.shopify.com/s/files/1/0439/4686/8891/files/battlefield_2_map_pack_single_player.pdf
    • https://cdn.shopify.com/s/files/1/0439/3179/5624/files/botudalomidule.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/punjab_castes_denzil_ibbetson.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/rugemewubukojepozado.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xefafozerokadugatevaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/software_attendance_management_solution_p206.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8847/files/sezavarolesapasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/gejabiz.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_off0000716d.bin
39907e538fa37ec3495b761fa38d87519fa66b5e72cb156e75b8145a4ac08c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716D 5164 bytes
font_01_sfnt_off00008305.bin
e92474b643b972f56e85ab7ffb4caa46900e5e77fd6f02cb8682bf2739c70639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8305 10692 bytes
font_02_sfnt_off0000a693.bin
beec37f135ee97cc43f5cfa6e53be96d713bd9afea7cf77bd52f7c7e78e3abb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA693 16268 bytes

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