Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efa3fe463340b37…

MALICIOUS

PDF

40.7 KB Created: 2020-10-02 09:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3eac4124a8d4faef9b2347e3f881a296 SHA-1: 3b4c28eb77bc8642bcef99789375eae3e81c6e31 SHA-256: 4efa3fe463340b37197ec65ba5051a6a87291714f31b794f296b2cf3d46b6931
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://ggtraff.ru/strik?keyword=sim+card+reader+driver+windows+10 In PDF document text
    • http://files.ronaprea.com/uploads/1/3/2/7/132740424/3977455.pdfIn PDF document text
    • http://bajujotaz.purpleclovefarms.com/uploads/1/3/1/4/131482993/c9c704d7f32451.pdfIn PDF document text
    • http://files.gozoboutiquehotelaccommodation.com/uploads/1/3/1/4/131406239/wezetu-pupenusap-gonese.pdfIn PDF document text
    • https://site-1037827.mozfiles.com/files/1037827/dejukinabelupefuveka.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/jelovefarevokilep.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/lufubumetaw.pdfIn PDF document text
    • https://site-1038478.mozfiles.com/files/1038478/lalufofozesudegoretumoda.pdfIn PDF document text
    • https://site-1036713.mozfiles.com/files/1036713/39514431377.pdfIn PDF document text
    • https://site-1037883.mozfiles.com/files/1037883/zesikekifosusupan.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/34238065178.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/1/0478/1293/5847/files/kyou_kara_maou.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/dragon_slayer_2_quick_guide_osrs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/xunegar.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_off0000614e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614E 5504 bytes
SHA-256: 328bd24ed95ec6adf7756df7a2af6affb2d83527606ada9d20a6d38dd11f3efb
font_01_sfnt_off00007407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7407 10068 bytes
SHA-256: 333efc624e8521a6aec1cb77b79c92824fb4f7b0abff1a3625146fa6ac2b6940

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