Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0305920d791bc9…

MALICIOUS

PDF

34.9 KB Created: 2020-08-10 20:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a215981646e18bd484c37d55583581d SHA-1: d44fdd56fac5257598c8b673e9407559ec02a725 SHA-256: dc0305920d791bc9a087fd43a7d136260ead3fc2838599c86908216c12addad9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Konkani catholic bible pdf' and the malicious URL. The primary attack pattern involves luring the user to click a link that redirects to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this 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=konkani+catholic+bible+pdf
    • http://files.hannahjoanfilms.com/uploads/1/3/2/6/132696030/furidozobiloxaz_radexu.pdf
    • http://files.markjmusic.com/uploads/1/3/0/7/130775396/puzebelotijalixox.pdf
    • http://files.samahanfilamheritage.org/uploads/1/3/1/6/131607075/batuzawisor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2892/3046/files/17168322829.pdf
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/google_sheets_delete_empty_rows.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/xurotalilogevu.pdf
    • https://cdn.shopify.com/s/files/1/0441/3269/6216/files/54919074485.pdf
    • https://cdn.shopify.com/s/files/1/0432/5965/8398/files/lawufu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/texas_new_hire_reporting_form.pdf
    • https://cdn.shopify.com/s/files/1/0439/3913/5643/files/rotinebineboloposiluduro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9046/0324/files/effects_of_illicit_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/13411697514.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/58814663282.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/77859387678.pdf
    • https://cdn.shopify.com/s/files/1/0433/8892/8150/files/sunilibuvorekos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3330/files/lafaneragodafox.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6630/files/34532586564.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_off00004ac7.bin
4b076b68430de0c4dfe12d1fc9f5ee2c8fe5a286c8c1ca888ac3d9d23436c82f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC7 5140 bytes
font_01_sfnt_off00005c3a.bin
8b24d8c3655e73e07f6cd85b54ae3abc91f855bf0133aacd4ba54902600368be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3A 9996 bytes

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