Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9db59ff8533c797…

MALICIOUS

PDF

75.6 KB Created: 2020-08-12 09:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b1b4bcf32c39a6e059cd2cc1dac9770 SHA-1: 054627bb744219a1ed40fe7429fac41d16a21e9b SHA-256: b9db59ff8533c7970a9854f832c435add30d216244e06f6ee95df3a53fad6a1f
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The primary attack pattern involves luring users to click on these links, which then lead to malicious infrastructure.

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=cambridge+advanced+result+pdf
    • http://files.warrnamboolracingpigeonclub.com/uploads/1/3/1/4/131411596/e983c15.pdf
    • http://files.yournonprofitnow.com/uploads/1/3/1/4/131414743/29a19b9642b041.pdf
    • http://lolog.moveablefeats.com/uploads/1/3/1/4/131408100/nomavumatemab.pdf
    • https://cdn.shopify.com/s/files/1/0436/0637/6611/files/alta_via_dolomiti_4.pdf
    • https://cdn.shopify.com/s/files/1/0434/8687/1712/files/deconstruction_derrida.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/baldur_s_gate_ipad_walkthrough_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/amenaza_y_trabajo_de_parto_pretermino.pdf
    • https://cdn.shopify.com/s/files/1/0432/4360/2080/files/what_is_mcdonaldization.pdf
    • https://cdn.shopify.com/s/files/1/0440/8003/8053/files/core_java_multiple_choice_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/zitepibi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8924/5861/files/camera_scanner_to_apk_pro.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0746/files/vorukoxadirejaxodivizane.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8136/files/xudujekud.pdf
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/soal_barisan_dan_deret_kelas_8.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_off0000e541.bin
c32be4de23dd49eab6800de85324ee2c658557a5e6667083e3d24799c1c6ae67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 5580 bytes
font_01_sfnt_off0000f82c.bin
ec7a9def503efb7fd2d93d3675fc1a7c71471a94edce83d39f1cc29a136dbcaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 12768 bytes

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