Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d21dcef1276081f…

MALICIOUS

PDF

32.0 KB Created: 2020-08-19 14:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc07bb721f7f98c675b37accea0ce3a6 SHA-1: 179d7196f280461e2861b9da4184c3d35ed92525 SHA-256: 7d21dcef1276081f9b8422b8b47ed387498635259b05dc1b0e847b396c00b859
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=cartoonz+crew+flop+song'. It also exhibits a PDF link farm heuristic, containing numerous links to other PDF files hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document body, though partially corrupted, contains the primary malicious URL and references to other PDF 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.cc/pify?keyword=cartoonz+crew+flop+song
    • http://files.lincomglobal.com/uploads/1/3/2/3/132303083/bopigivasigobi.pdf
    • http://files.arthurmeek.com/uploads/1/3/0/9/130969472/lozunafaga.pdf
    • http://divop.blackbearinnmoreton.co.uk/uploads/1/3/1/3/131398008/2584353.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2734/7109/files/92065402321.pdf
    • https://cdn.shopify.com/s/files/1/0437/6746/4093/files/26481840732.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/wordly_wise_3000_book_7_lesson_6.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/odisha_cabinet_minister_list_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/81529338034.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/xuwifilajuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4011/files/8071615107.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_off0000425b.bin
e3a939d40f1edbdfa43608c098188fd63147e3158317b491e87df779de096e53
pdf-font-stream PDF embedded font (sfnt) at offset 0x425B 5228 bytes
font_01_sfnt_off00005454.bin
28281272f70c44b7a8a3b0ee336a635095a6c22eb028e2e042a83ba5e4ec4d26
pdf-font-stream PDF embedded font (sfnt) at offset 0x5454 9228 bytes