Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6f4c5f440904eb…

MALICIOUS

PDF

42.3 KB Created: 2020-08-19 09:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7e1e948cf90966b1f59c4eef7c94397 SHA-1: f6638f91bf431bfc8c1eeb80e23e7babc8b10a9a SHA-256: 9c6f4c5f440904eb3d2279d9523d3f1d4a8bf6558a092a006767617ef27bf7e6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users into clicking on further malicious links. The document body, though heavily obfuscated, contains text related to updating a Facebook app, suggesting a social engineering pretext. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=actualizar+facebook+app+android
    • http://files.bellsilvs.com/uploads/1/3/0/8/130814856/9708845.pdf
    • http://files.francoiskabore.com/uploads/1/3/0/7/130739833/1483810.pdf
    • http://files.susmanosextendidasmexico.com/uploads/1/3/1/4/131482881/571592.pdf
    • http://files.fabiolapiedadmariaalicia.com/uploads/1/3/1/4/131453026/4b29766101db0f7.pdf
    • http://vujoxe.rubbertrackswarehouse.com/uploads/1/3/1/6/131637881/026389b49b5f0.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/fizaberizo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/83177209980.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/52617542199.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/reporting_regression_results.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/tabusop.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8904/files/gizanisemezojufag.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/59281449687.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/solution_of_system_of_linear_algebraic_equations.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/fibixusedesijib.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/apa_citation_format_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/7175/6698/files/artusi_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/6927/5286/files/zebifoberofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/pharmaceutical_inorganic_chemistry_practical_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/3_column_cash_book_questions_and_answers.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/
    • https://cdn.shopify.com/s/files/1/0434/6927/5286/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006736.bin
00c7127c3ca219447c603e2881a93352f9b239ee8c4b15c56943ed9fe7c40241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6736 5216 bytes
font_01_sfnt_off00007902.bin
08ce86c7ad7543114a5970f289f662c27f78fe5d34db0a30588bcbdc262b4d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7902 10308 bytes

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