Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cfc44aaba36404…

MALICIOUS

PDF

69.3 KB Created: 2020-08-26 01:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ff9a1233c838ef74bed0aad7b964b5a SHA-1: 1950e115e04ff10b16a5c6a64697934d6b3bfd83 SHA-256: 02cfc44aaba364040f2af588cf381978a47ced25efc1ea651309fc7a5710d40a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm hosted on Shopify, which is a strong indicator of SEO manipulation for malicious purposes. One critical heuristic identified a link to a known malicious redirector, suggesting an attempt to lead users to harmful content. The document body, though partially corrupted, contains a URL that appears to be the primary lure.

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.link/pify?keyword=actividades+de+ubicacion+espacial+en+preescolar
    • http://mudoxok.chan-candy.com/uploads/1/3/1/1/131164250/aba31f7d6d260a8.pdf
    • http://files.naturesedgeeq.com/uploads/1/3/1/6/131606046/741244.pdf
    • http://files.pacengtech.com/uploads/1/3/0/7/130775635/f39d485087.pdf
    • http://files.westcoastjen.com/uploads/1/3/1/6/131606111/9902366.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8144/9118/files/screening_methods_for_antidiabetic_activity.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/casting_defects_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/15653367154.pdf
    • https://cdn.shopify.com/s/files/1/0435/3336/9503/files/21873626036.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/madea_goes_to_jail_play_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/5623/3638/files/vademecum_aceites_esenciales.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/tasker_profiles_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6345/files/telugu_calendar_2020_new_jersey.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/37625392666.pdf
    • https://cdn.shopify.com/s/files/1/0461/9835/8165/files/afinia_l501_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/puratogafule.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/paraphrase_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6645/files/13559469353.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_off0000b7e2.bin
76a8f8f50389d614d09c49f05c5169645317324dad96ef8f6c7e39d6b1286e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E2 5256 bytes
font_01_sfnt_off0000c9bd.bin
9d73d838d3bb86ec9a5f98622f443b9dd336edca46b387b07446314fa0417e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 11816 bytes
font_02_sfnt_off0000f068.bin
bf2bb651642035a19e1b8bf5dc55c4db7948913289cd11d1f66f0c65c0fed8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 16080 bytes

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