Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa691d74da953b1b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 15:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ace0cec9bb3634bfbf715bc1d8483649 SHA-1: 915ed35162fae8ffc8dbda7ce90566344ae7be15 SHA-256: aa691d74da953b1baf8792c3e3e15958f471ebd248ed2d1098e9b006f71ef534
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as information about a plastic sheet cutting machine. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the link leads to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a spam or phishing campaign. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=automatic+plastic+sheet+cutting+machine
    • https://static.usrfiles.com/ugd/b8c837_e10ee5f6e76d49589f79dae644af953f.pdf
    • https://static.usrfiles.com/ugd/45e30f_3054b41d777f4c9b9bf6bc5e2bbc6a34.pdf
    • https://static.usrfiles.com/ugd/b444d4_d00eacbd56f84c74b4f0046c24570710.pdf
    • https://static.usrfiles.com/ugd/d43733_31716b0106bf465a9e877f12cc205d88.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecb7db2ebfd14b9392d61fde998c4381.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/baraxoke.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0836/files/phonetics_meaning_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/61408989096.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/84051707682.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/savifedilukajotivax.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/amiel_tison_neurological_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3333/files/96935642953.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/sekuwenup.pdf
    • https://static.usrfiles.com/ugd/b8c837_296ec66715ba4332ac3a6f6da1f5606d.pdf
    • https://static.usrfiles.com/ugd/221f3a_3bf58fa8aa0b445d92a9233b6f847992.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_off00005d2c.bin
395ff894528a27dd9f928e2a750831c4c89a2152de9336ca0d9170a590abd3a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2C 5240 bytes
font_01_sfnt_off00006eda.bin
1dc1ba1758321a71ad5c5436011b17fae29297cbe2344d2c5ebf718a73e853cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDA 10152 bytes

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