Malicious PDF — malware analysis report

Static analysis result for SHA-256 168666fc2d0bf96c…

MALICIOUS

PDF

45.1 KB Created: 2020-07-22 01:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 116879c96780a37e42cb9b5c819ecf8a SHA-1: 1d08ca214f25ea0f08ce8f1312c5d42cda50248d SHA-256: 168666fc2d0bf96c85f949639cce447c7e5a324debd956ef07c0c4c25fc3b063
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary link redirects to a known malicious redirector, suggesting an attempt to lead users to harmful content or phishing sites. 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/wb?keyword=automatic%20drip%20irrigation%20system%20pdf
    • http://files.townofharmony.org/uploads/1/3/1/8/131872015/nudaluvabif_suvokagujelon.pdf
    • http://files.awrightdehernandez.com/uploads/1/3/0/7/130739510/290758.pdf
    • http://files.lhec.org/uploads/1/3/1/3/131381946/5091926.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/weragi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/rexufexegegimilerabiviz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nelafujadodejofit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/gijike.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://jolagurotot.files.wordpress.com/2020/07/tegusofunenowuvusimow.pdf
    • https://zuterejesami.files.wordpress.com/2020/07/12484678090.pdf
    • https://kuwozosu.files.wordpress.com/2020/07/56361484548.pdf
    • https://saxerigokej.files.wordpress.com/2020/07/49029131018.pdf
    • https://bafupidaruf.files.wordpress.com/2020/07/57758433513.pdf
    • https://cdn.shopify.com/s/files/1/0430/4837/0333/files/87028272971.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/potukulonedejabodazop.pdf
    • https://cdn.shopify.com/s/files/1/0435/7118/3777/files/32343147595.pdf
    • https://cdn.shopify.com/s/files/1/0428/1512/7708/files/fimeva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0035/6251/files/xadiragajazere.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/85973459940.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7175/files/66577122631.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/bidelijeboxofafijebopuzub.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_off000071aa.bin
0f5a7f87f1fec19927a9f17dc594fa793d1853f128789bc6c42ef135716bb9f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AA 5416 bytes
font_01_sfnt_off00008404.bin
1f1f0f6c8e4ed6e887fdfc86a52c608356fdf7ec3d5977f8a56f37d743b50aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8404 10156 bytes

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