Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1ce03f4dbb59c7…

MALICIOUS

PDF

54.2 KB Created: 2020-09-07 02:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db06c50caf615bd734149bb1ec9f7f4d SHA-1: 927b138bf226d194fae8a431b3e1d953c45004ae SHA-256: df1ce03f4dbb59c7972af6d831e1b6e4596acdfe7b946d926f13b87e7b6d87dc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/pify?keyword=diabetes+diagnosis+guidelines+canada'. The document body, though heavily obfuscated, appears to contain this same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute malicious content through seemingly benign links. The ML classifier strongly flagged this PDF as malicious.

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.me/pify?keyword=diabetes+diagnosis+guidelines+canada
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/magova.pdf
    • https://cdn.shopify.com/s/files/1/0431/3553/3218/files/the_tough_kid_book_practical_classroom_management_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/54182016151.pdf
    • https://cdn.shopify.com/s/files/1/0437/6425/2826/files/applied_economics_textbook_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0461/3675/4329/files/fubuzodufag.pdf
    • https://cdn.shopify.com/s/files/1/0460/7862/3908/files/tenants_in_common_deed_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/grau_de_um_grau_de_calculadora.pdf
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/jozikovejadowudus.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/55773772384.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4678/files/29532141253.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/69825684465.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/auto_electrician_manual.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095d7.bin
79372be36d4cc59cf12787b8516ac9426d49745b371468cedf3cdd0306ad021e
pdf-font-stream PDF embedded font (sfnt) at offset 0x95D7 5148 bytes
font_01_sfnt_off0000a76e.bin
2f0b611624ad9f7f4abc8078e2d05f60feee5bb8e4838eed3eb06dba47a0ab4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA76E 10796 bytes