Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66bae1b9ad0ca6b…

MALICIOUS

PDF

40.0 KB Created: 2020-10-02 08:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 57087e08ad11df67ea800a09897d36cf SHA-1: 10fc70b86305a0771c7560f3f8320b8e1f90720b SHA-256: e66bae1b9ad0ca6b0a432239fd96321bcddf61d58b3c6222f9709a120f6ee23c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a large number of external PDF links suggests an attempt to obscure the malicious destination or engage in SEO poisoning to attract victims.

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://ggtraff.ru/strik?keyword=restriction+enzyme+worksheet+answers In PDF document text
    • https://site-1039600.mozfiles.com/files/1039600/37275753589.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/patogugizowedere.pdfIn PDF document text
    • https://site-1036829.mozfiles.com/files/1036829/6218381656.pdfIn PDF document text
    • https://site-1039707.mozfiles.com/files/1039707/77770856376.pdfIn PDF document text
    • http://files.getwirelessnz.com/uploads/1/3/0/8/130813582/zisenegofukilexafepo.pdfIn PDF document text
    • http://files.bhurbanhillapartments.com/uploads/1/3/0/9/130969489/sevevofodavuwa-morizusawaberu.pdfIn PDF document text
    • http://files.wildthymecatering.co.uk/uploads/1/3/1/0/131070842/gixizogalaxobi.pdfIn PDF document text
    • http://files.milliganproductions.com/uploads/1/3/1/4/131483719/donitegijeb-juxesusomidakog-bisotisaverak-tigikobovepomik.pdfIn PDF document text
    • http://zodam.anneremmel.com/uploads/1/3/0/7/130776661/6644746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3784/1813/files/northglenn_middle_school_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4165/5454/files/life_of_pi_summary_shmoop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7791/3764/files/mixapozewemelonor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/saketevato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9238/8261/files/2zz-ge_performance_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9963/8945/files/legend_on_a_map.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F11 5324 bytes
SHA-256: f0e938a050d6b12f8463c5a76ff604de46c902d9ea74b59fcc8256f20487e512
font_01_sfnt_off00007121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 10000 bytes
SHA-256: 776829cae320312409a8f2c449e2d2d6da5a526ad3ad76c6247a3c87f10284e9

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