Malicious PDF — malware analysis report

Static analysis result for SHA-256 424a949ac1209824…

MALICIOUS

PDF

54.5 KB Created: 2020-07-31 17:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8853668418087827f13176dd4ba7b0d SHA-1: d7953e01f312c65b953efdf9d69d2ba678ac704a SHA-256: 424a949ac12098245668765e91ae5e35befba795ebf59d4ec56c88229337386d
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be luring the user to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=insertion+sort+java
    • http://files.raycraighead.com/uploads/1/3/2/7/132740214/melumasuwuvewodigug.pdf
    • http://files.mrsbrownsmusicroom.com/uploads/1/3/1/3/131379833/4808061.pdf
    • http://files.haralsoncountyhistory.com/uploads/1/3/2/3/132302913/4438840.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/nelomanube.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5459/files/18253437228.pdf
    • https://cdn.shopify.com/s/files/1/0428/9003/5366/files/56632143184.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/40655015222.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/16197098258.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/pififemesav.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/femes.pdf
    • https://cdn.shopify.com/s/files/1/0435/6970/9217/files/buvunivopuxupifakovu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/48764370493.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/novizupudujivovuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0432/2692/3172/files/nijubexe.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
stream_005_off0000b3d6.bin
11a2d1fd0f2ba376780b27414018abc9cee2c40b2906e8ac807894f66d6e3c3d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB3D6 17204 bytes
font_00_sfnt_off00007c9e.bin
bd715cac4d4057d0263d6c5286b5d4bc073aeeeef6a60fcf9e4e25ba2bfa5a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9E 4720 bytes
font_01_sfnt_off00008cbb.bin
1589a859347e4f89283d90bc93a1f9f65190b523c9c15b9aafcc595ed25e1df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBB 11384 bytes

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