Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dce51c133d2ae1…

MALICIOUS

PDF

40.1 KB Created: 2020-10-01 02:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6e86c583db4b72f1cf683530c4421201 SHA-1: d9182b9d52b2f1146ffea344d2f41ca05a70be0c SHA-256: 51dce51c133d2ae1cbb97a8e54a3f1efa3bf0bc09fae175d6ced4fd8e31c12a3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/strik?keyword=assembly+language+tutorial+pdf+free+download, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for a free download, likely to facilitate initial access via spearphishing. The ML classifier strongly indicates maliciousness.

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://cctraff.ru/strik?keyword=assembly+language+tutorial+pdf+free+download In PDF document text
    • http://files.dynamicmgt.com/uploads/1/3/2/7/132741162/8a24d9.pdfIn PDF document text
    • http://numogot.lawfirmcebu.com/uploads/1/3/0/8/130874118/mibowodibulewevawi.pdfIn PDF document text
    • http://files.yanivtaubenhouse.com/uploads/1/3/1/3/131398374/webefi_deseji_nezimaxob_jekekaj.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/1/0428/9282/0647/files/jivedikajixokonubanidigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/rf_to_eu_minecraft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9090/2166/files/photosynthesis_absorption_spectrum_l.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/blaue_reiter_almanach.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8864/2197/files/bose_noise_cancelling_earbuds_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/naravemanedasowamaka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/4325/3406/files/sebia_capillary_electrophoresis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/gakimazux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d24cd4-8a09-4f5d-8021-4ad270e8d7d5/32861513767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1afeb5-e426-4229-ba91-0abf2e8b5b0d/rokemevisaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfbfbbb-7640-4073-94d7-0c8fee97eba0/pozewelizatuguzog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3f3506-bee7-4279-a54f-0d8d098a7471/72011004761.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_off00005d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2B 5684 bytes
SHA-256: 9d5c3d02a2e687416346d776bab3b3ea23666a8f275a3f7f942deaa4362104fd
font_01_sfnt_off0000707e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707E 10192 bytes
SHA-256: 6500058b01ad3a15ad950ec24e00175e85f1936879df098750f5a2e354c18148

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