Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef57854f5dcc2eb1…

MALICIOUS

PDF

40.8 KB Created: 2020-08-16 17:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4211b60211769c161c0038eb50acdef1 SHA-1: 97e5593f02f795d5464b0f79886c6a6985f0f726 SHA-256: ef57854f5dcc2eb10963855a1ff9b01d46ce1a5b8d1136dbb83882d41b247833
120 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic identifying it as a PDF SEO link farm. One of the primary links points to a known malicious redirector. The document body is heavily obfuscated and contains a URL that matches the redirector, suggesting the document's purpose is to lure users to malicious infrastructure.

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=sscanf+boolean+format
    • http://files.shareschinese.com/uploads/1/3/1/4/131454352/2370c607.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/sizugeroxikarera.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/71444031548.pdf
    • https://cdn.shopify.com/s/files/1/0449/8967/7736/files/administrao_geral_e_pblica_para_concursos_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1626/files/the_human_brain_book_rita_carter_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/89433743240.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/66492667663.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/analytic_geometry_parabola.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2455/files/appium_start_android_emulator.pdf
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/boiler_water_treatment_process.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/james_stewart_calculus_8th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1519/files/boss_rc_30_loop_station_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4507/5609/files/94681647244.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_off00005bac.bin
47db75fb3f442978f702baa00f3b72c4b88a5106dea92f814c0745af7364a2ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAC 5272 bytes
font_01_sfnt_off00006d76.bin
e105f1c638fe9a6bb524accbd6ec5cdef5b653b632ec2b598ecb8a0c8018eea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D76 12908 bytes

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