Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2831f94919d03f…

MALICIOUS

PDF

52.7 KB Created: 2020-10-05 22:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7f767ecc2755e5f4d7e6225ae5a29f49 SHA-1: 7b6254831431d5c7fe8b700488316784a79e7dcf SHA-256: 9e2831f94919d03fcd1002781775ceeda8e0dc5b6c569a8899cdeb448d1a865d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier also flagged the PDF as malicious with high confidence. The document body appears to be obfuscated or corrupted, but the presence of multiple links to potentially untrusted domains suggests a link farm or SEO spam campaign, possibly intended to drive traffic to malicious sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=abbi+glines+making+a+play+pdf In PDF document text
    • http://sopinir.minnisandmums.com/uploads/1/3/1/3/131383664/duwefobezozax-xoravoluladoson-mopin.pdfIn PDF document text
    • http://pawuxovix.christinahankinsart.com/uploads/1/3/2/3/132302978/5015941.pdfIn PDF document text
    • http://dukib.sbcchapelhill.com/uploads/1/3/2/8/132814930/5076812.pdfIn PDF document text
    • http://files.indianlandsocceracademy.com/uploads/1/3/1/8/131871484/5373403.pdfIn PDF document text
    • http://files.1stoplocksmiths.com/uploads/1/3/0/7/130776726/kexogopegebevama.pdfIn PDF document text
    • http://files.ecodragonplumbingandheating.com/uploads/1/3/0/8/130874254/tebux_pironajomixaga_biroxuri_sababovunoj.pdfIn PDF document text
    • http://files.ashleylarnold.com/uploads/1/3/2/3/132302982/dagewexi_jidisi.pdfIn PDF document text
    • http://files.runningtheory.org/uploads/1/3/0/9/130969543/xevutarikuzilox.pdfIn PDF document text
    • http://fuxuveve.sheslayybyrenee.com/uploads/1/3/2/6/132681951/7606626.pdfIn PDF document text
    • http://files.redesignforwholefamilies.com/uploads/1/3/1/8/131857193/jowudakavesof-rusodisoton-zofokizubolas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/318c84f4-6e98-4301-a309-9f50c1218e7f/15471640713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c936ddb3-562b-4fd6-ba75-a29191ba352f/87179839935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16900d1-9a99-42de-a729-ac067c42b6c4/maguxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17ffea5-43e7-4292-9c32-2b1e661592d6/kofagilinadalumerewologe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/tequila_zombies_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0131/4456/files/fridley_high_school_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/8696/2582/files/the_hearts_invisible_furies_amazon.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD3 5560 bytes
SHA-256: c67d9040d1a72c1511edecb8f39d40b0b0c19f485c001243476adc994503b907
font_01_sfnt_off00008dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC9 10188 bytes
SHA-256: 875ddf6f4c33cb07295c548bac81c86606f45538a65fa65f4da29164468dbfe0
font_02_sfnt_off0000b096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB096 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848