Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee589d6a588e1c5b…

MALICIOUS

PDF

36.3 KB Created: 2020-08-23 04:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc4fd1526df130c142b2c33d4c604870 SHA-1: c0f03f1d4c4348ee9cbbd30c4238d93ab8303bf7 SHA-256: ee589d6a588e1c5b995fc16e5a2cc6cc10430d51fa1c78c3a47c1df3488b1a4c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains text related to 'bubble test answer sheet generator' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=bubble+test+answer+sheet+generator
    • http://jusetuwo.chantal-pollier.com/uploads/1/3/1/3/131380349/80d10ad267c.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/wijukitu.pdf
    • https://cdn.shopify.com/s/files/1/0447/9811/6006/files/batman_arkham_origins_apk_unlimited_money.pdf
    • https://cdn.shopify.com/s/files/1/0448/3383/3122/files/adeept_arduino_ultimate_starter_kit.pdf
    • https://cdn.shopify.com/s/files/1/0451/3752/6949/files/accountancy_comprehensive_project_for_class_12_cbse_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/16148158141.pdf
    • https://cdn.shopify.com/s/files/1/0437/3161/5909/files/29527669064.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/fundamentals_and_applications_of_nanomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2837/files/rename_a_column_in_pandas.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/69304618348.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/historia_de_los_billetes_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0462/5730/7797/files/flexner_report_racism.pdf
    • https://cdn.shopify.com/s/files/1/0449/9508/4452/files/classification_of_cardiac_arrhythmias.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/20842628367.pdf
    • https://cdn.shopify.com/s/files/1/0434/6164/0342/files/14438320346.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_off00005018.bin
7edeaa3716d1568b6d12dd3f5ec120bb4bbce6c9bd4a536ae313302bff69f8a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5018 5228 bytes
font_01_sfnt_off000061e6.bin
93f6094a916e4e8197cf4f3311d8fc43b88d4edefe0d3a78b11c4123a5b2616e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 10068 bytes

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