Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88931f2fd997ec4…

MALICIOUS

PDF

47.6 KB Created: 2020-08-24 18:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2c3a6f0c882eecc223d30e96a39a100 SHA-1: 5aa0d6eb72c3598e4cd20eabdc5c224db144644c SHA-256: e88931f2fd997ec4121967b1c4627930b4df7e91fdbdee61f1b4958af8af8ac7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, suggests a lure related to a "Types of chemical reactions lab worksheet". The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, many hosted on cdn.shopify.com, likely for SEO manipulation to increase visibility.

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=types+of+chemical+reactions+lab+worksheet
    • http://files.pnc1948.org/uploads/1/3/1/4/131409200/bobajarinig.pdf
    • http://gupigowiz.atreeanditsfruit.com/uploads/1/3/2/6/132681812/998458.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/kidosuxam.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/fuwapariweb.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/46189911471.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/game_center_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/glencoe_7th_grade_math_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/84999065136.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/4430396493.pdf
    • https://cdn.shopify.com/s/files/1/0431/9140/2660/files/keurig_k40_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/6483/3686/files/29203750610.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35679391278.pdf
    • https://cdn.shopify.com/s/files/1/0434/6875/0998/files/xiwuwixedegavon.pdf
    • https://cdn.shopify.com/s/files/1/0432/9560/4891/files/cav_scout_dress_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0440/2026/9221/files/mowanaxitijumopigu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/25597853120.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073c0.bin
c89852358dea76396c08bdf3af3ef5ad45be3124e0eeaff1ee61db19148692db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C0 5600 bytes
font_01_sfnt_off000086c5.bin
599b3d1cfc617d1c0e097cd6878fb043ce060b303b89f0406a11804dc8078a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C5 13816 bytes

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