Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb4109873667812…

MALICIOUS

PDF

50.4 KB Created: 2020-08-19 18:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae3548c98b3bfe97de921824e83e7b5 SHA-1: 376e7a3759153394b070f2d19d664822f0d83037 SHA-256: 8cb4109873667812d447e57260c561b1b2a1cbec4611ac0a01af16a41db379ae
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic identifying it as a link farm pointing to a malicious redirector. The primary redirector URL is https://ttraff.ru/pify?keyword=bootstrap+material+icon. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to the redirector and other URLs, suggesting a lure to external content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=bootstrap+material+icon
    • http://files.beyondbodyclinic.com/uploads/1/3/0/8/130813516/b7323521ce5b.pdf
    • http://files.lifecoachmaurita.com/uploads/1/3/0/8/130814342/0bdda82e8.pdf
    • http://files.onemindpdx.com/uploads/1/3/0/9/130969370/piwavune-xezukibab.pdf
    • http://files.annparkin.studio/uploads/1/3/1/4/131453990/7037043.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bizem.pdf
    • https://cdn.shopify.com/s/files/1/0432/9799/6960/files/certificado_medico_cdmx_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/90300014873.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3984/files/ethiopia_reporter_gazeta.pdf
    • https://cdn.shopify.com/s/files/1/0437/0520/4888/files/nekefosebixamipanezag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8918/files/fulafurokagibiwuvul.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/abrsm_grade_5_theory_past_papers_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/5341/4565/files/amazon_synod_instrumentum_laboris_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/4th_grade_spelling_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/35041506221.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/ritunuxanetewer.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/mcdonalds_printable_coupons_2016.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_off000082ca.bin
e94f9cf390464b1d09ae8f7b71f29e5a88054fb3b811096d8d4f8ddb9d392d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 5128 bytes
font_01_sfnt_off00009420.bin
7fbb320cadebcec8eca6e0e0aef7b5d333c20f782c075df4455beee8ebf7fcac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9420 12656 bytes

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