Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34c08b4765d9d65…

MALICIOUS

PDF

44.3 KB Created: 2020-08-09 15:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2292cfc91a19e8f1051e2b9ee5438ee3 SHA-1: a2fbba5f18f0e83897bbb1de8e4f2f2bfadae8cd SHA-256: c34c08b4765d9d65c63fa84851d75e650c4c54380aa09baf67274ccface130b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many of which point to Shopify domains hosting what appear to be academic papers. However, one critical link, disguised as a 'bulletin of mathematical biology pdf', redirects through 'ttraff.cc', a known malicious redirector. This suggests a social engineering tactic to trick users into downloading potentially malicious content by masquerading as legitimate research material. The ML classifier strongly supports the malicious nature of this PDF.

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=bulletin+of+mathematical+biology+pdf
    • http://files.projectrestorationllc.com/uploads/1/3/0/9/130969796/c9d98777962.pdf
    • http://files.popculturecentral.com/uploads/1/3/2/8/132814933/dc2c65c90d630f.pdf
    • http://files.thomaslemonart.com/uploads/1/3/1/4/131452942/lelaraxodegak.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8078/files/22620653625.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/49244636299.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/20593926438.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/dunogus.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/fokabebiwiri.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/behavior_management_in_pediatric_dentistry.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/lurefebobamuxepuxibaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/blink_malcolm_gladwell_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/zamaguzidejiti.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1703/files/gemeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/1854/2504/files/online_cv_maker_in_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/negamivaxodasezas.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/netflix_error_m7111-_5059.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_off00006de5.bin
0d135bf5eeb7f46a9ec9d63e7eba548d90bf7e90422a5a80612c20a6f7914a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE5 5584 bytes
font_01_sfnt_off000080ca.bin
4f6e9e0aed9aa347b33bc6b0530b23761aea427176cde10e023a9a09e752a6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80CA 10396 bytes

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