Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7b511fae5b1ad1…

MALICIOUS

PDF

47.9 KB Created: 2020-08-18 19:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cacb588733f38d23b6823789fc419473 SHA-1: 4d7fa3031e54d3b2b3f3562540d007354971800d SHA-256: ba7b511fae5b1ad10677ce4e0a4111e5731dfaa9001439079c4488896346e20e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.cc/pify?keyword=email+auto+reply+message+format', is designed to redirect users to further malicious content. Another critical heuristic identified a PDF link farm, indicating a large number of outbound links, many hosted on cdn.shopify.com, likely for SEO poisoning or to obscure the final destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=email+auto+reply+message+format
    • http://files.northwoodselementary.org/uploads/1/3/2/6/132695258/vurad.pdf
    • http://repebewut.colonialbaptistbradenton.com/uploads/1/3/1/4/131438416/7760318dd367.pdf
    • http://perav.adamandserena.com/uploads/1/3/1/4/131437987/ramarafiloviw_xomof.pdf
    • http://sidas.chrisdufala.com/uploads/1/3/1/8/131858530/sekoganunazivi-muletefopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/xapated.pdf
    • https://cdn.shopify.com/s/files/1/0432/7702/5446/files/12117305827.pdf
    • https://cdn.shopify.com/s/files/1/0448/4169/7441/files/cauchy_sequence.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/fetekapikoveno.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1871/files/the_canterbury_tales_pardoner_s_tale.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/8782176257.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1274/files/94088325155.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/xigipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/ashrae_90._1_si_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/9919/9390/files/53206150098.pdf
    • https://cdn.shopify.com/s/files/1/0443/4529/5004/files/nurel.pdf
    • https://cdn.shopify.com/s/files/1/0441/4596/7256/files/83885395014.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072cf.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CF 2828 bytes
font_01_sfnt_off00007cca.bin
9dfbfa19c3f7e46b69bff3c8c5c9247233127da1c61982f9a35edafdd8b8c284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCA 5280 bytes
font_02_sfnt_off00008eb0.bin
639cfaafe0e10dfff31d3f2e9b17191678443d5b10dab6946fbadd9864ae04fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB0 9820 bytes

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