Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ad8acbc5ea99f1…

MALICIOUS

PDF

52.0 KB Created: 2020-10-01 01:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 022de840020df35e07adf9f4dabd8d69 SHA-1: 535e34e37e7160cbb5a941aef3eab7c045986dd7 SHA-256: e8ad8acbc5ea99f1156a98e88f76635fa88e5a6a0c6ef65502ef2ee76c385626
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier also strongly indicated maliciousness. The document body text and embedded URLs suggest a lure related to 'tratamiento de escabiosis pdf', likely a pretext to drive traffic to malicious sites.

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 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.
  • 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=tratamiento+de+escabiosis+pdf In PDF document text
    • http://jagodije.azgreggs.com/uploads/1/3/1/4/131482952/836994.pdfIn PDF document text
    • http://vegisuku.ehoomana.com/uploads/1/3/0/8/130874134/fenedufasekaji_bixuruvesa_mubuwali_bijejonita.pdfIn PDF document text
    • http://sarin.evertonnurseryschoolandfamilycentre.org/uploads/1/3/1/4/131438759/874797.pdfIn PDF document text
    • http://pekulad.whatthefunkdenver.com/uploads/1/3/0/7/130776138/melelowedodux_sexanuv_xurer_kugukixosiw.pdfIn PDF document text
    • http://wulim.acumeridians.com/uploads/1/3/1/4/131407405/8a5e2a681b1aadc.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/4edd65ed-779a-4f36-828f-b74e5262a985/rumolovumujomezowizuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0262ed-dd5e-4b55-a82f-2cb317a14afc/vanogidamudij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38474755-a57c-4aaa-af66-1823e5592aac/riwunatisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a054487-3769-4c8a-be10-24d315c0f5ca/8248322436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a49ccfa-0410-4b81-853f-c0b83ac12152/tijonatoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939fe76d-8bb5-4f12-9790-b84830200bb0/51022204723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1085c6ba-5d3b-47a0-b91b-c3c4a59e6c8e/modorebanideg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71edc45-24bb-4067-af72-097ac5914140/38304094832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831e2486-0344-432f-8e00-a1cfd8801fcb/5577770838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65152ed2-ba34-458c-aa8d-81951aec4505/poxirivuvajagodinewatav.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_off00008b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B92 5356 bytes
SHA-256: 33733ba1b170a75b514a20b8ce1ca9fb1f9e3e626568fe8eb8ce80e0b4e20948
font_01_sfnt_off00009da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA9 11168 bytes
SHA-256: 7ef2e9fe981983489feb1ffb2e8ceba7bff9bd228d2013d0ada7d0428e0109c7

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