Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57403b2e6a53c0f…

MALICIOUS

PDF

41.6 KB Created: 2020-10-15 02:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1b175f8fd9c85d929c14428dd13673f8 SHA-1: 27e91b1d4b9490ee150bccd1430c039ca875f1e0 SHA-256: a57403b2e6a53c0f5bed5e292487f244139719d7681ebbaced21d29d5a36fa9e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://cctraff.ru/strik?keyword=dinosaur+king+apk+download In PDF document text
    • https://site-1048517.mozfiles.com/files/1048517/63538065845.pdfIn PDF document text
    • https://site-1039801.mozfiles.com/files/1039801/nokawolote.pdfIn PDF document text
    • https://site-1040780.mozfiles.com/files/1040780/13367711873.pdfIn PDF document text
    • https://site-1041611.mozfiles.com/files/1041611/49547220507.pdfIn PDF document text
    • https://site-1038897.mozfiles.com/files/1038897/nirejojegafitijusazu.pdfIn PDF document text
    • https://site-1039472.mozfiles.com/files/1039472/funexun.pdfIn PDF document text
    • https://site-1038967.mozfiles.com/files/1038967/69868996135.pdfIn PDF document text
    • https://site-1043699.mozfiles.com/files/1043699/77431815276.pdfIn PDF document text
    • https://site-1048166.mozfiles.com/files/1048166/loom_knitting_instructions_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f8772642320b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f87899c97381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f877f4198e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f877e4daafea.pdfIn PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/mafanutelavir.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/48934370798.pdfIn PDF document text
    • https://site-1041081.mozfiles.com/files/1041081/wematusijuv.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/1/0496/1127/6440/files/24312089521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/1284/3414/files/juzerujedelekekitusas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8196/9063/files/algebra_1_textbook_structure_and_method.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0931/3438/files/23414747375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5207/2612/files/princess_academy_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4776006d-ed1f-4e4d-b3e4-4142d2ee29f2/7649666942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946b4dc3-699a-4c23-9c7c-5c213c7d8d47/bikagaxedolene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34676e2d-0a99-4958-ae05-4a2b5938e42c/regovasapibofuwuwok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/674488ba-1293-4c7c-ba86-055b55c4dbeb/ribufenironuxigulu.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_off00004ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EF3 4640 bytes
SHA-256: 4ee7fff7baf2234e3dafd9cf3723333062aef0b2a11cbc2474537e952f3a2311
font_01_sfnt_off00005f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0D 5280 bytes
SHA-256: c7e03418c9093463aaac1252a35763620a5fed9595ed95b256512cab264a34b7
font_02_sfnt_off00007127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7127 13156 bytes
SHA-256: 49ee6bef44785c0abf5a4868c516851bcd87206dc9331c9dbfc50dd47846eb13