Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c38976ec873b1e…

MALICIOUS

PDF

56.2 KB Created: 2020-08-21 21:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6cd70778782ffac0251cc231a8e7b2 SHA-1: 337af6aa608e95212ef1df16f16f9b8fa1b6b6cc SHA-256: 04c38976ec873b1e9c196e47a6a99c8855fc8faadaf8a0c05196c846202c0d02
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links, including one pointing to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=template+newsletter+per+outlook'. The document body, though heavily obfuscated, contains text suggesting it is a 'Template newsletter per outlook'. The presence of numerous external PDF links, many with numeric slugs, indicates a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=template+newsletter+per+outlook
    • http://files.grandviewlodgeandresort.com/uploads/1/3/0/8/130874298/8979132.pdf
    • http://tadak.mentalhealthaca.com/uploads/1/3/1/4/131407089/lomopevejub_nodoku_gukipuwu_falebop.pdf
    • http://files.hsisign.com/uploads/1/3/2/7/132712050/9712d0c67fcf.pdf
    • http://files.reddeerkinettes.ca/uploads/1/3/1/6/131607117/tunafavarulefi.pdf
    • http://files.fordservoboretransmissionfixsolution.com/uploads/1/3/2/3/132302711/3667253.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/38216708165.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/circle_of_fifths_chart.pdf
    • https://cdn.shopify.com/s/files/1/0439/5279/9902/files/feelings_and_emotions_worksheets_printable.pdf
    • https://cdn.shopify.com/s/files/1/0439/1531/3307/files/xefunexezuminetanedomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/99780211210.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/84652119633.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/woxetumikivakurazuwubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9279/4774/files/85440771616.pdf
    • https://cdn.shopify.com/s/files/1/0441/3734/9272/files/virtualbox_resize_vmdk.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_off0000a0b9.bin
32add9ee57dad5ea404aeb95da78ab990827f23c070e150d7a86a9f0a5a7ba8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B9 5072 bytes
font_01_sfnt_off0000b1f3.bin
2d4dbe8c27da9f03ba1e38a406aa0073044064eb3ac64d9aa7216f2abbb08398		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F3 10060 bytes

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