Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1db537988de21b…

MALICIOUS

PDF

78.9 KB Created: 2021-01-12 21:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 709ff34ca6c450f2f53ff38dd4963291 SHA-1: 6fd6badfd900f31264332864c040d0e7fd6b9f8b SHA-256: aa1db537988de21b16d165cf8ad7a926c800c2114644ecaffacea684fa9bdae9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS classification. The document body, though heavily obfuscated, appears to be a lure related to a game, likely intended to trick users into clicking the malicious links. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=zombocalypse+2+hacked+unblocked+6969 In PDF document text
    • https://cdn.sqhk.co/lilapanorup/tLhdhjH/goleg.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/kgijcCS/37605440209.pdfIn PDF document text
    • https://site-1171850.mozfiles.com/files/1171850/longman_business_english_dictionary_app.pdfIn PDF document text
    • https://site-1203255.mozfiles.com/files/1203255/rukezaxetawukedurat.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/kedudovagixinonijexatifa.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/h8Hgcih/revuvujij.pdfIn PDF document text
    • https://fepazizagi.weebly.com/uploads/1/3/5/3/135345318/a796a08.pdfIn PDF document text
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/padozokinunewe_gisegilisupel_notepetorenojel_muvusakune.pdfIn PDF document text
    • https://site-1166659.mozfiles.com/files/1166659/45295502057.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/gfucsie/53248688910.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/dHhbima/dog_fighting_games_pc.pdfIn PDF document text
    • https://site-1168101.mozfiles.com/files/1168101/shin_chan_movie_list_in_tamil.pdfIn PDF document text
    • https://site-1168414.mozfiles.com/files/1168414/zuvolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fifomi/definicion_de_diabetes_mellitus_tipo_2_segun_la_oms.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_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 5924 bytes
SHA-256: 805c1da30c6c9550b46ac52976ff3e209ac4dd0cd8831f3040abadf1007a1ca0
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 10376 bytes
SHA-256: ca083cbf27eb95c2457e3b262e2d835a7e724c548cc6761e61442d3d3b530914

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