Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a76fc7f9a81a2b4…

MALICIOUS

PDF

49.4 KB Created: 2020-08-31 03:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adf530e1d20dbbbf494721a8f29a36c1 SHA-1: 909bce3bde31587defb8313009c5ee2dfdbfcc2e SHA-256: 0a76fc7f9a81a2b483044036cdbf8b41530529deb47dbf526fc356dd45dd91e8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm of 22 external PDF links, with the primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This indicates a likely attempt to lure users to malicious infrastructure, potentially for further exploitation or phishing. No scripts were extracted, but the PDF structure and embedded links strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.com/wix?keyword=commercial+aquaponics+system+design+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_17963acb331840cca5b61073832d538e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbad77c40c464302a7f3396c96280163.pdf
    • https://static.usrfiles.com/ugd/7f16bd_57200954b9cb4e808d0e095252e089f0.pdf
    • https://static.usrfiles.com/ugd/daca0d_a6e152f9aa49419192440b249c97e1ce.pdf
    • https://static.usrfiles.com/ugd/a86d68_ea78c4d2c2a4479e9a9762d540708370.pdf
    • https://static.usrfiles.com/ugd/2b3f46_6a774e5eaad84f4492215996973ddd3e.pdf
    • https://static.usrfiles.com/ugd/455f95_693bfe5962854042b2294fa49222bb67.pdf
    • https://static.usrfiles.com/ugd/105a8c_c42641439c2a462590f6b887122558ea.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_f5dbec7e0b834e3a89627934c8de4a4c.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1464/files/ditorasidop.pdf
    • https://cdn.shopify.com/s/files/1/0434/9214/7366/files/html_table_to_jquery.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e4e.bin
ec821bccd32e535602969ac1eaf55bfb5ab782585f2010392e58cbd7aeb6564a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4E 5608 bytes
font_01_sfnt_off00009141.bin
61ec5e80df0eec5effa7ee77bea0581dbe42ef7165076d801941ce32b0ad7fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9141 12292 bytes

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