Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6cb387e0336e1a…

MALICIOUS

PDF

43.0 KB Created: 2020-10-03 16:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 50f01c436ff7d015d8f151020307b9ea SHA-1: d15744a05f02d8d81dc2cb151f2b7b6f9e39d0d2 SHA-256: 5c6cb387e0336e1a5bb7e2d3b89e55e522aeaf42eeda6d40ab30f73718640787
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute other malicious PDFs. One prominent link leads to a known malicious redirector. The document body, though heavily obfuscated, contains text related to game ROMs, suggesting a lure to entice clicks on these malicious links.

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=fire+emblem+new+mystery+of+the+emblem+rom+japanese In PDF document text
    • http://files.ladavisbooksllc.com/uploads/1/3/1/4/131406527/3794575.pdfIn PDF document text
    • http://files.aamakarateschool.net/uploads/1/3/0/7/130776519/916ba3ca.pdfIn PDF document text
    • http://seminiki.squidflip.com/uploads/1/3/0/9/130969352/4035e856.pdfIn PDF document text
    • http://sefiji.tuba-artist.com/uploads/1/3/1/4/131408024/xufavexum.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/1/0441/2496/2968/files/ttorrent_pro_apk_latest.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5323/3814/files/kopisapuxulev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4548/4706/files/62965020488.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/21078953005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5f0c16-ce0e-404f-ba1a-04099521d71a/piwagasumufefokibiwef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ca5b40-394f-4648-bd76-ea5461a114f8/wutisikomolozabaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F69 6848 bytes
SHA-256: cc36b4bda37995084716cea1168d30d81a6a08bd0b73d00e81d7da373c5ff423
font_01_sfnt_off000066ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AB 5508 bytes
SHA-256: d99f8ee74f30e72264106bffa3932da62aef905604bcab5a0389edf97c6953d5
font_02_sfnt_off00007951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7951 10288 bytes
SHA-256: 8039d945a0062cc43c4a76680d9f978212fdccd16bf478d7d0e60ced032e1b89

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