Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e04150abaefee19…

MALICIOUS

PDF

42.0 KB Created: 2020-08-03 07:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bda5337f14ac2e2e255d3748a8b1ab3 SHA-1: f65402d6e282027dfd9c753023a6669a9001a492 SHA-256: 5e04150abaefee191edc81cd4d71ad7297ebd4b74dd794ba6044fd8d6c4c4468
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external resources, including a known malicious redirector. The document body, though partially corrupted, suggests a lure related to educational content ('Vertical and horizontal shifts of functions worksheet'). The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate malicious intent, likely to drive traffic to potentially harmful sites or host further malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classification point to a high likelihood of malicious activity.

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/wb?keyword=vertical%20and%20horizontal%20shifts%20of%20functions%20worksheet
    • http://files.virginiarlca.org/uploads/1/3/0/7/130739570/1951985.pdf
    • http://files.cvsmusic.com/uploads/1/3/2/6/132681559/sewiwazis.pdf
    • http://files.vvphotography.ca/uploads/1/3/2/6/132683088/12ab9b6a.pdf
    • http://files.banhmibites.com/uploads/1/3/1/1/131164236/tebivetezodedup_kigijigaxajido_wuvubojoka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/64782677915.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/kodijapez.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/lifelopozuvasizagotusanim.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2454/files/solidworks_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/windows_7_repair_disk.pdf
    • https://cdn.shopify.com/s/files/1/0436/0224/7838/files/35604305012.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/dokepekisuzipijapifilo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/lusasenosonulozufogizetim.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/zizaboweletatixopuxewebum.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/vinezinefikobisi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3802/1544/files/33828551163.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_off000066f1.bin
80143361533b1c6b58cf446e2f6d17f78cb7d3fe51993e846cdfb6f836943800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F1 5280 bytes
font_01_sfnt_off000078fd.bin
73202e788e7f7eec0313598e887adb5eabbd16be0da8b4c7e21f49a0dbf1638f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FD 9944 bytes

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