Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec50f1794f871a5…

MALICIOUS

PDF

39.4 KB Created: 2020-10-09 23:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 92b68d94c151675102b568ef4643b075 SHA-1: 3cb01b4dfb8a210e806bb5bcb7f8256770ebd4aa SHA-256: cec50f1794f871a584cc2a3434127320e51b0bb3f44761e452e15e3095d170dc
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a worksheet answer key. The document body, though heavily obfuscated, contains the URL for the malicious redirector and several other URLs pointing to benign Shopify files, likely part of a link farm to improve SEO for the malicious URL. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=identifying+gerunds+participles+and+infinitives+worksheets+answers+pdf In PDF document text
    • http://jejifizig.chrissychristian.com/uploads/1/3/1/3/131381658/xakabute-wakanefenusu.pdfIn PDF document text
    • http://bebes.perfectfreq.com/uploads/1/3/1/6/131637881/3bc03.pdfIn PDF document text
    • http://files.studiobhub.com/uploads/1/3/1/1/131163980/c2cf83110.pdfIn PDF document text
    • http://dokodewem.lsttclub.org/uploads/1/3/2/6/132695213/090c8a6137.pdfIn PDF document text
    • http://files.luisnarvaezmonsivais.com/uploads/1/3/1/1/131163620/4470387.pdfIn PDF document text
    • https://site-1039350.mozfiles.com/files/1039350/jirusis.pdfIn PDF document text
    • https://site-1039283.mozfiles.com/files/1039283/nukowitamanulipof.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/50863876042.pdfIn PDF document text
    • https://site-1038920.mozfiles.com/files/1038920/92576145124.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/wofogofefadolududosiseraw.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/1/0480/3421/8133/files/taco_bell_calories_chalupa_supreme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0944/0935/files/aviation_boatswains_mate_fuels_civilian_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/9092/1622/files/amway_water_filter_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3097/7434/files/real_statistics_resource_pack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9132/0214/files/best_hacked_flash_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/google_empathy_lab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9051/2545/files/jisibebelajuzejosum.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_off00005a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1B 5672 bytes
SHA-256: 9b96688f45dc8c75528c75eb3c54905529a6523be5872c539d51dd988ca0d49c
font_01_sfnt_off00006d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8D 10000 bytes
SHA-256: 72addfa5ebff8c63259deedce6cf9086221bbcb2eac5eb660bebec30b1cfbdbb

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