Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c8bb46d52212fb…

MALICIOUS

PDF

41.7 KB Created: 2020-07-31 19:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 423607303880b9fcd8a412f92bdfa4bd SHA-1: e0cfb51fa1f86e05eff7a9ab37bc6b68f8d7600b SHA-256: 67c8bb46d52212fb76b9c567065dc4bdf5f703c52665cf1f97543d0cf09debaf
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the same redirect URL and a list of other PDF links, suggesting a link farm or SEO poisoning attempt. 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=jordin+sparks+one+step+at+a+time
    • http://files.shaareitorahcincinnati.org/uploads/1/3/1/4/131453902/pubomojek.pdf
    • http://files.drumsmithstudio.com/uploads/1/3/0/9/130969352/5903461.pdf
    • http://files.hawkknifedesigns.com/uploads/1/3/0/7/130739099/pewaxagajimoti_diduzijivurodow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/93235092682.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/jafigoledufoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/mimotodeludoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/42493170823.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2165/files/venilap.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/54755023219.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/10312224369.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/444488990.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/93930286825.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/76488133927.pdf
    • https://cdn.shopify.com/s/files/1/0434/5508/6742/files/bixad.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4968/files/jamejajadopot.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/7723965169.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058fc.bin
1df725095b19e3d2b9d9d4a2ee6201a06a15ac089617b500c6fc3d0b0164c5cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58FC 4912 bytes
font_01_sfnt_off0000698f.bin
74ac32f29ed607d18e70a52b34c6b2c90e2c3be87143c418f9bc18aba74c3a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698F 9956 bytes
font_02_sfnt_off00008ba0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA0 4324 bytes

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