Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce14a386325d3ead…

MALICIOUS

PDF

33.7 KB Created: 2020-07-08 18:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd2abb53eae79004a9a630e22d3cd6d6 SHA-1: 6ddb06186d4ca379a4290688f6102657b8d81bd5 SHA-256: ce14a386325d3ead986deab3f6a2e8834ca9958501740dcf58dd6d673b1e17f3
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The document body and embedded links suggest a lure to download further malicious content, likely disguised as academic material. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=sistema%20respiratorio%20pdf%20diapositivas
    • http://files.headstart-getcap.org/uploads/1/3/1/3/131380138/6cd55d2.pdf
    • http://files.martialhartamas.com/uploads/1/3/0/8/130814279/6186ec0be38b.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • http://files.mrtsautorepair.com/uploads/1/3/1/4/131437823/vogokan_tujetopafax_xunavi.pdf
    • http://files.tylermoorefilms.com/uploads/1/3/1/4/131438499/1219661.pdf
    • http://files.haywardfitnessfanatics.com/uploads/1/3/0/8/130874413/dugen.pdf
    • http://files.josepblas.com/uploads/1/3/1/4/131437268/kiwinorubidosa.pdf
    • http://files.quantumpoint.org/uploads/1/3/0/8/130874031/fexurugomaseba_livorejalolokib_kuluvewowa.pdf
    • https://nezemifuz.files.wordpress.com/2020/06/71801875938.pdf
    • https://bidumuweso.files.wordpress.com/2020/07/75006859768.pdf
    • https://segokowiw.files.wordpress.com/2020/06/81437422508.pdf
    • https://pariwofa.files.wordpress.com/2020/06/62802385938.pdf
    • https://zebofupafu.files.wordpress.com/2020/07/19409817737.pdf
    • https://lajotulej.files.wordpress.com/2020/06/vukabupefela.pdf
    • https://dotuwapifufe.files.wordpress.com/2020/06/dumubiruwozasufij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zorugeligix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.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_off00004add.bin
936bf7fdd3d66f98f8f1cd34585b4a4c3e00bad71002e3a4d3a6a8720b11b097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADD 5000 bytes
font_01_sfnt_off00005bda.bin
997c25e893876e5f0566a82433e7c7882a3d515378ae53393cb47ca75712e77a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDA 8712 bytes

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