Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdce0c5c325e8499…

MALICIOUS

PDF

44.4 KB Created: 2020-08-10 11:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd0d244bb71e7b6c768037cb00333648 SHA-1: 1c00db45a1d003baa3e6d7ebe517a109c5ef7080 SHA-256: fdce0c5c325e8499bd55235bdd72b5edc11c0d93d5a25b5bb3ae5ae63e8f60e3
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). The document body, though heavily obfuscated, contains text related to a 'free download' lure, which aligns with the malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link.

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=bird+anatomy+for+artists+pdf+free+download
    • http://files.sharingeducationlearningforlife.org/uploads/1/3/0/9/130969904/13301b070.pdf
    • http://pepabomet.peacepantry.org/uploads/1/3/1/1/131164250/56156c43a.pdf
    • http://files.squirrelgazer.com/uploads/1/3/2/7/132740435/povoraxaga.pdf
    • http://files.nusourcellc.com/uploads/1/3/0/7/130775071/8e61beb8c77f7.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/electro_swing_artists.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nijudesiko.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/51905308305.pdf
    • https://cdn.shopify.com/s/files/1/0437/1025/1176/files/zipefafifefini.pdf
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/seforewikuxe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4032/4256/files/13631238127.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/modowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/totafodup.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/75054124163.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8999/files/468789199.pdf
    • https://cdn.shopify.com/s/files/1/0433/3980/8922/files/42926641201.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/74402806457.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/60934001249.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/8218390231.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_off00006f35.bin
3893861ab5d53d958fe74dd4842a2db834cf0a3e3b661433e1c146874b21fc5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F35 5432 bytes
font_01_sfnt_off000081b6.bin
f20209c8dc7a8d294cbf4f2d9f26e0b4699d11ca3663a1f90d3a7ee3b4e057fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B6 10036 bytes

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