Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f10efd6a2b4cab…

MALICIOUS

PDF

48.7 KB Created: 2020-08-25 10:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddbabc4563975e6804858d17a8ebba62 SHA-1: 39cafb7a74f2612352a9d2a84669cee08e6df7f9 SHA-256: 55f10efd6a2b4cab8ae1852402d681d888de7250ffe249106dc7cddd86b0eadf
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'NCSA basketball recruiting guidelines' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation to increase visibility. The ML_NYX_PDF_MALICIOUS heuristic further confirms the malicious nature of the PDF.

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.ru/pify?keyword=ncsa+basketball+recruiting+guidelines
    • http://maravifo.sassyarabia.com/uploads/1/3/0/8/130874426/2567911.pdf
    • http://sivufon.avanticentrae.com/uploads/1/3/0/9/130969204/8727173.pdf
    • http://ranexevor.callcavalry.com/uploads/1/3/1/6/131606069/keporalupupos.pdf
    • http://zemesafo.fairytaleparties.ca/uploads/1/3/1/8/131856054/dajivovuwabesuteda.pdf
    • https://cdn.shopify.com/s/files/1/0434/5295/6838/files/935689285.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/navapowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7798/2626/files/bronkopneumonia_pada_anak_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8133/files/convert_to_a_fillable_form_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/9086/8379/files/nakoruwuzekivekuzozomevi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/benim_hocam_trke_kpss_soru_bankas.pdf
    • https://cdn.shopify.com/s/files/1/0434/4840/2081/files/ana_catalina_emmerick_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/affidavit_of_birth.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/odia_sambalpuri_song_video_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0434/5715/1142/files/alan_turing_the_enigma_by_andrew_hodges.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/dafevolajemuj.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/1/0434/4840/2081/files/an

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007367.bin
fbf42c2ea7b2724b9421e0f648e2ff04b2dfd20ee6096126932eb01e8e32763d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7367 5052 bytes
font_01_sfnt_off00008496.bin
7a661f482558f900573e050cb6c739962a3ffc9ce5480783b63afab85be7f73b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8496 10304 bytes
font_02_sfnt_off0000a755.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA755 4324 bytes

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