Malicious PDF — malware analysis report

Static analysis result for SHA-256 335a6e0c09a834df…

MALICIOUS

PDF

38.2 KB Created: 2020-08-31 12:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9768b499655942dcf5abdc063bcd1bec SHA-1: c4cfaaef31e4affd89f61ea0d4ef4b949fa72201 SHA-256: 335a6e0c09a834df13d72cf14f2c8e6b0e8abdd1172c8995e1cf1daebd6ad6a3
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=bttv+emotes+android'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0429/5534/1977/files/barnes_and_noble_application_form.pdf'. The document body, though heavily obfuscated, appears to contain these URLs, suggesting an attempt to trick users into visiting the malicious 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/wix?keyword=bttv+emotes+android
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/barnes_and_noble_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6675/files/online_voting_system_project_report_in_php.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6045/files/czasy_przysze_angielski_wiczenia_z_odpowiedziami.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/xoxavaganefofadinaze.pdf
    • https://static.usrfiles.com/ugd/b8c837_46097ce2206045ce97267481e2a31680.pdf
    • https://static.usrfiles.com/ugd/270e53_a37129bce8e34f0d97dfa96192ebaab4.pdf
    • https://cdn.shopify.com/s/files/1/0437/1434/7160/files/nipumasuniwepijajuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/28435402111.pdf
    • https://cdn.shopify.com/s/files/1/0436/0044/5597/files/lee_1000_progressive_press.pdf
    • https://cdn.shopify.com/s/files/1/0454/4672/5790/files/radical_candor.pdf
    • https://cdn.shopify.com/s/files/1/0469/0257/5266/files/2348392517.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_off00005965.bin
b7a73d4a60a9f87e479492f94f0f7a3c4eba416b0b3278f4225e9ac47e445d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5965 5048 bytes
font_01_sfnt_off00006a7e.bin
9626d6f7f7bbb226c48f1a24cd7070d4b0aff18e7a723284f865b040da1103e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7E 10184 bytes

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