Malicious PDF — malware analysis report

Static analysis result for SHA-256 894509f112bd1fe2…

MALICIOUS

PDF

45.2 KB Created: 2020-08-26 01:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0d17a81096534580920d0f1167f67c2 SHA-1: e0c718d256e131afe5cf59f28c0f3d8f6ba92fde SHA-256: 894509f112bd1fe2c88ca714e427006e5bd4d1da451c5f3a992b15ce4aa4b182
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a nutritional guide, which is a common social engineering tactic. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several other URLs, some of which are benign Shopify links and others are unknown or potentially malicious. The primary malicious URL is `https://ttraff.cc/pify?keyword=chuy%2527s+nutritional+guide`, which is a known redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=chuy%2527s+nutritional+guide
    • http://files.jrestrada.com/uploads/1/3/0/9/130969855/ff447d2b7.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/kanal.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/android_ordner_mit_pc_synchronisieren.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0118/files/11674201518.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/ccht_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/16230893059.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0963/files/dulumutotivodavapetov.pdf
    • https://cdn.shopify.com/s/files/1/0432/0146/2436/files/buzumenosoge.pdf
    • https://cdn.shopify.com/s/files/1/0429/7362/6524/files/pontiac_firebird_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/catalytic_reforming_donald_m_little.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/vefazagavepab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9892/3427/files/96414052204.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_off000064c2.bin
2d09b3795abda8d0f04d6b7e38559af511b84e73c8cecaeb019e1876a2d4866f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C2 5128 bytes
font_01_sfnt_off00007631.bin
71d19b26adcca6ffea73c98a300683326004d95d4a007b90f992dadd0f53ca28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7631 15484 bytes

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