Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f9acca975e4b6c…

MALICIOUS

PDF

39.1 KB Created: 2020-08-22 10:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a726f407b54a5b53eb60bbc4911a26af SHA-1: 3a3bf863a0c8c92f15e2db4d9cd7dcdd080ca89a SHA-256: b1f9acca975e4b6cbb15e32c43ab5bb7e110a8e165992ed420611e640160091c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=clash+royale+online++ios`. This link is presented within the document body, alongside other links that appear to be part of a link farm, with the primary malicious link disguised as a game guide. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the presence of a malicious redirector strongly suggests a phishing or social engineering attempt.

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=clash+royale+online++ios
    • http://files.nwcwc.net/uploads/1/3/1/3/131383953/sabifilifupagu.pdf
    • http://files.masterroofingaus.com/uploads/1/3/1/6/131636923/tuwenezodovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/ni_no_kuni_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1967/files/graph_linear_inequalities_in_two_variables_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/4483/8303/files/ea_cricket_sports_game_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/2040/2336/files/quantitative_aptitude_formulas_bankers_adda.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/gafozolokinepudovopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/nikola_tesla_3_6_9_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9833/3599/files/important_current_affairs_of_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/64688701816.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/51369667421.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/physiology_practical_ak_jain.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_off00005e5f.bin
0eea38692d1c210a7b5071cec66721d006c2ab6de2f377b890f7927b6ed1567b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5F 4780 bytes
font_01_sfnt_off00006e95.bin
7f11591b5750b5c542da077928786353c5ba190050e494c36a8a04709f0e2278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E95 9856 bytes

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