Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4c577bda9e733b…

MALICIOUS

PDF

55.6 KB Created: 2020-09-29 20:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 631b18bd72dfe2afa2bafe3660e8458c SHA-1: 072e98553301f30742c0cab19a1d0bc2656c5f4c SHA-256: ad4c577bda9e733b2420720aabde4c8f021985ff85a36b4fee55b41b36e36348
124 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains URLs pointing to potentially harmful infrastructure. The primary attack pattern involves directing users to external malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=aphorisms+of+hippocrates+pdf In PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/lepupibuvukiwajujowavaxo.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/51037534504.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/73474662614.pdfIn PDF document text
    • http://files.postcardsforamerica.com/uploads/1/3/0/8/130814967/xizoniburo_rafowete_vejefodupiniros.pdfIn PDF document text
    • http://files.jennlogg.com/uploads/1/3/2/8/132814906/sovopot.pdfIn PDF document text
    • http://xibis.yvonneburton.net/uploads/1/3/1/1/131164312/9952729.pdfIn PDF document text
    • http://pokizu.chinoyouthmuseum.com/uploads/1/3/0/7/130739664/37bb0a5785885ff.pdfIn PDF document text
    • http://files.hornandivory.net/uploads/1/3/1/4/131411987/zatajelewodegisin.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/1/0479/9542/0831/files/how_to_beat_sensei_club_penguin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/89505353038.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/69987107819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6e4c41-c72d-41fe-bada-1baaf09b7842/26676969440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6badaa88-0295-4d9a-9b1a-72455c4b7650/dekalifopokaladu.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000958a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x958A 5352 bytes
SHA-256: 84180b9b8773812bcefd6a08331c97991c5eab58aae29fcaa7dba021d9d6d34c
font_01_sfnt_off0000a794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA794 16836 bytes
SHA-256: 24c6e097239d40d7bd2cc94baac285191d04c9f55fe449978349184e228b3f46

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