Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a35444c97ff9f8…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 02:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0791f8da2848b28917c66993b162af8f SHA-1: e5907c3dc7776af7b82fab5e9eaf9f8952d42cba SHA-256: 02a35444c97ff9f86f0a67042f55d864cc662877bac3a13beb711fa80d246e49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=html+form+select+disable+option'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, some of which are hosted on potentially compromised Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious sites via embedded links.

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.com/pify?keyword=html+form+select+disable+option
    • http://jubovid.ellybeautysupply.com/uploads/1/3/1/4/131408024/d695bb22b.pdf
    • http://nemuna.northernbcreining.com/uploads/1/3/1/1/131164250/paxejozinogak.pdf
    • http://redama.decipherink.com/uploads/1/3/1/4/131438025/b855ec009e61cbe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2668/4824/files/arrl_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0444/6588/1255/files/mapa_barcelona_ciudad.pdf
    • https://cdn.shopify.com/s/files/1/0431/6787/5221/files/mickey_mouse_clubhouse_s04e05.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/zoropi.pdf
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/bahishti_zewar_nikah_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/original_examples_of_compound_complex_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0430/4453/6473/files/the_central_science_13th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/9543/9000/files/cfa_level_2_study_material.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/79079647504.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/64130362292.pdf
    • https://cdn.shopify.com/s/files/1/0433/4940/9960/files/38252430667.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/cyprus_visa_application_form_jordan.pdf
    • https://cdn.shopify.com/s/files/1/0432/2141/8147/files/73067146584.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_off000055d8.bin
045526129ae26185411ebff29a38e68d756bd4f99a520f971058548da23f2939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55D8 5404 bytes
font_01_sfnt_off00006813.bin
554ea30d1e066a8a7d41163c179e90081f01bcb9c18c3d5c93e3aab6b53cdea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6813 11552 bytes
font_02_sfnt_off00008dc4.bin
b12fd7abebef46c6af06114fd52e3a226bf6873093cd64b6bfea0858fd0ebc42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC4 16076 bytes

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