Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baab6a0a885e9cf…

MALICIOUS

PDF

55.9 KB Created: 2020-08-10 14:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd61b4c75144a7af21253cae32814584 SHA-1: 60eec92165b56589e77b02244997f625971c9855 SHA-256: 3baab6a0a885e9cfc10369f45634567c6169d9b1d2aba47dc6316ac920be1b78
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed for SEO manipulation, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is https://ttraff.com/pify?keyword=applied+mathematics+1+matrices+pdf, which is likely used to lure victims into clicking on seemingly legitimate academic content.

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.com/pify?keyword=applied+mathematics+1+matrices+pdf
    • http://files.thebellhouse.info/uploads/1/3/0/7/130739740/zanena.pdf
    • http://files.theartssociety-pewseyvale.com/uploads/1/3/1/4/131437563/273ba55ee90.pdf
    • http://files.holdenengineeringinc.com/uploads/1/3/2/6/132695629/basokin-gofitokuwuge-kupepexozi.pdf
    • http://files.fusionmindbodyspirit.com/uploads/1/3/1/4/131455680/5084148.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/mysql_replace_string.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/11223913326.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/behavioural_neuroscience_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/xupaxaxisobuvolosi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3336/files/boveneneduwodesuzuman.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/2751280468.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/sosutof.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9989/files/35200540130.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/zibisizironumaritewa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/warranty_card.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/larezi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5650/files/wedonugivopavi.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_off0000832d.bin
6072e4907c2ad68088f091375d90c74c805396dbed2fb644720266cbd168be56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832D 5436 bytes
font_01_sfnt_off00009582.bin
d8bcf1d1cb5917034da64ca19aade520a3c01c589fb4fb98c0b169cb523dd123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9582 12348 bytes
font_02_sfnt_off0000bd53.bin
116e1aefc1bdc9fdbdc8bc4ca32ed8fc2a9096b6ae60b76e258fcc2d5524df3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD53 16112 bytes

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