Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c9505844e3d178…

MALICIOUS

PDF

55.8 KB Created: 2020-07-14 20:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f572a9fd68c73f8856fa63772ec30ae8 SHA-1: 35ec5da052ab309829099cce64a59f3cd67e7a9d SHA-256: 79c9505844e3d178b630e8a47f802875eb3bd7f0276fc444ee36dd94125ce3f6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spam campaign. One critical heuristic indicates a link to known malicious redirector infrastructure. While no scripts were extracted, the presence of numerous links and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful content.

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.
  • ClamAV: Pdf.Dropper.Agent-9526382-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9526382-0
  • 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=8.4%20polar%20bonds%20and%20molecules%20worksheet
    • http://files.norcalherp.com/uploads/1/3/1/6/131606719/4094825.pdf
    • http://files.centrepointecincinnati.com/uploads/1/3/1/4/131406413/e08b8.pdf
    • http://files.morriscountypca.org/uploads/1/3/1/4/131438427/sizerupuzix-moxasezoporap-futepokupowiw-xajolu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/bifazerekabilasolo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/javorumaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/natepebepefemimupepatet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/xepilifitil.pdf
    • https://datefakifeba.files.wordpress.com/2020/07/77030654108.pdf
    • https://tudubopa.files.wordpress.com/2020/07/15220757.pdf
    • https://bidaleb.files.wordpress.com/2020/06/gemazagavuxoto.pdf
    • https://dulidegoli.files.wordpress.com/2020/07/11448941523.pdf
    • https://zuwisanupu.files.wordpress.com/2020/07/93858508819.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26450283228.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/zugifubibojafe.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/52294740436.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/luliwafepapenasezugifutaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/33239844522.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/92241145083.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/povumad.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0413/files/14860353577.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_off000098f2.bin
853e0dc715eebd0d74311510eb2609d850e3a23ca8e43c785b8298927ab9c73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F2 5664 bytes
font_01_sfnt_off0000ac11.bin
f24ffa5b6d7e8174daf16a847233cd47ee6518a51f38d4a9df71b9974a7d361d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC11 11100 bytes

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