Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbe5de24ae977d7…

MALICIOUS

PDF

48.4 KB Created: 2020-08-17 15:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11a5c98edb525be05c7382b9648b5818 SHA-1: f0882aec7a3a292f460823e9258f819921cf8b33 SHA-256: 9dbe5de24ae977d7fea54891fa7392c20e7cf6ea661e5279d52c54cb63ef37d5
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=chemical+functional+groups+pdf', suggesting a lure to a malicious site. The presence of numerous Shopify links, many of which are benign, is likely an attempt to blend in with legitimate content while masking the malicious redirector. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=chemical+functional+groups+pdf
    • http://files.santafebrickandpatio.com/uploads/1/3/2/8/132815019/xepokuvuvar-dusufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/venepisowubab.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/50195926668.pdf
    • https://cdn.shopify.com/s/files/1/0434/1855/0430/files/67597025767.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/sexesimevigumegik.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/final_cut_pro_x_templates.pdf
    • https://cdn.shopify.com/s/files/1/0437/3030/5175/files/financial_accounting_14th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/modetigawedipetozuxafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1901/0201/files/74742221205.pdf
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/latefafosojedewofoti.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/tazoxawuwejovusigutabasad.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/19950977897.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/71477412513.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_off00007fff.bin
732380d62cb092326b876b1cad6f404809e276e9f25d253a98e9a3dfcbff16d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFF 5476 bytes
font_01_sfnt_off0000926e.bin
a4e2e4852fff09736828097f55c2097e03aa9391784a0d12fd219a5d3f3f4c09
pdf-font-stream PDF embedded font (sfnt) at offset 0x926E 10052 bytes