Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11ea5803c44ab7a…

MALICIOUS

PDF

38.7 KB Created: 2020-10-05 14:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 624b7a18c9360ac63cf30768c12036b6 SHA-1: ef8e9dab1af93e98ba1c59a09bd462ea87cc7d50 SHA-256: a11ea5803c44ab7ae97a840feb3eab18992f62e530e9212ec5e75c0ee695dceb
164 Risk Score

Malware Insights

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

This PDF document contains multiple links, including one that redirects to known malicious infrastructure. The document body text and embedded URLs suggest a lure to download potentially malicious content disguised as search results. The ML classifier strongly indicated maliciousness, and the PDF structure includes links to disposable hosting and redirectors, indicating a link farm or phishing attempt.

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.
  • 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=king+gizzard+and+the+lizard+wizard+torrent In PDF document text
    • https://site-1039621.mozfiles.com/files/1039621/fisitonavoluzuvafilipam.pdfIn PDF document text
    • https://site-1036803.mozfiles.com/files/1036803/39325345090.pdfIn PDF document text
    • https://site-1039573.mozfiles.com/files/1039573/37233847821.pdfIn PDF document text
    • http://mozodurav.statelineliteracycouncilbeloit.org/uploads/1/3/0/7/130740086/zobumamema-mozosu-siluxusefoluwov-redosopopob.pdfIn PDF document text
    • http://juwoko.mwmresearchgroup.org/uploads/1/3/1/4/131438405/9523730.pdfIn PDF document text
    • http://files.inspiredturquoisetack.com/uploads/1/3/0/7/130775189/xiviwonaxunosirobufa.pdfIn PDF document text
    • http://files.ibuysfv.com/uploads/1/3/1/3/131383751/wofusigarumoka_morarizotam_reripodawuba.pdfIn PDF document text
    • http://biwadedal.comepc.org/uploads/1/3/1/8/131856439/jojezoxu_gidem.pdfIn PDF document text
    • http://junifel.9488.kofcva.org/uploads/1/3/0/7/130776485/718fae8f27646.pdfIn PDF document text
    • http://files.friendsofreadsd.org/uploads/1/3/0/8/130814408/migumut-gagufanozar-vazom.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/8abe49ca-7e2c-475e-abd7-7cd352a9f3f7/88404174625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a354fa9-b2f7-4939-becb-1c551feca23e/berakaxisibawuxa.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_off000059c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59C2 5020 bytes
SHA-256: 3b54248473105c3a016ee3b9583c0e09cfbdf11575fd46d6e80568a6838ba3b0
font_01_sfnt_off00006af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF0 10376 bytes
SHA-256: c616c525f47a77103c6c17ab0bda95a7f53c9fe6a9c6a158f713a1503cf41359

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