Malicious PDF — malware analysis report

Static analysis result for SHA-256 900165c45816aa9b…

MALICIOUS

PDF

39.1 KB Created: 2020-08-15 06:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c38f8a4ef8d3545a752ee00c016963ed SHA-1: 7dccaf8fd50b9604cf50744e33debc0a855c4cf0 SHA-256: 900165c45816aa9bb0452ca4f5256899dee2904165e7f6608c1ee11cc163f376
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This indicates the document is designed to lure users to a potentially harmful site. The presence of numerous other embedded links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=jumbled+sentences+with+answers+for+class+10
    • http://files.sonescs.com/uploads/1/3/1/6/131606807/3455393.pdf
    • http://files.serendipityondurham.com/uploads/1/3/1/8/131872104/tirorijo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/4905531940.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/jeziv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/32048304584.pdf
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/57830275042.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/basic_knowledge_of_computer_hardware_and_software.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1185/files/entrepreneurship_management.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4982/files/l80_gps_module_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8078/files/varibuserofex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagitigupi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/sebibesoxezetimeduz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/project_on_social_issues_for_class_10_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/koguwemu.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_off00005a00.bin
3179daf06bb58211157a595e6f69f76a4d512f53ef38514f8103c480d3db8bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A00 5676 bytes
font_01_sfnt_off00006d30.bin
af8bcd98ae814735c9500b1043a1c1d8efedcebd1f06a010dc40249d855c5215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D30 10020 bytes

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