Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fef82d5a23562b…

MALICIOUS

PDF

36.1 KB Created: 2020-09-30 04:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d2375f2f1a012cb5724da5baf1af21a SHA-1: e1b616eb059a507da4826b51897f2846fea633ec SHA-256: 13fef82d5a23562bd8bec15d46639043c8e82ab07ab333aac5db927dd390c5a9
162 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector link, suggesting an attempt to direct users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=seven+penguin+readers+level+4+pdf In PDF document text
    • http://files.primalqifitness.com/uploads/1/3/2/6/132681144/xotozotaxevoko.pdfIn PDF document text
    • http://files.cefdauphin.com/uploads/1/3/1/8/131857626/zudinajavo_redisowufun_rilalos_fuzara.pdfIn PDF document text
    • http://jodete.thosjazz.com/uploads/1/3/1/4/131437595/xorepanunima-vuritepojuz-lobigi.pdfIn PDF document text
    • http://nexalisax.lamatstudio.com/uploads/1/3/0/8/130813829/zugebewo.pdfIn PDF document text
    • https://site-1037228.mozfiles.com/files/1037228/jimotovidizobena.pdfIn PDF document text
    • https://site-1037894.mozfiles.com/files/1037894/febupemilubojiriku.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/16448252041.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/1/0486/1296/6560/files/zajavu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0030/2240/files/pathfinder_cleric_feats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/whats_in_the_box_meme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/44559457950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/55027613919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229a1a4d-d7ed-4789-996e-aebc10ef0250/55393808297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c832db8e-441c-48fe-9948-b24207de1d48/8241366355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4497a8f8-1b13-40b8-ad58-7433570cf7f1/jijudologi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5038f1a3-94bb-44c2-b978-ee88c090b3d0/77677502227.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_off00004e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6F 5460 bytes
SHA-256: 6ae8a991d77a15f02b8e299a6a738f9b9b7c723abe02274d3329f760bcd8ffed
font_01_sfnt_off00006124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 10144 bytes
SHA-256: 84efa3c68ed477d44a02c7175375ecb9510b749eb78e23b7f81da6ce57907cd8

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