Malicious PDF — malware analysis report

Static analysis result for SHA-256 403f32f0878878d8…

MALICIOUS

PDF

40.8 KB Created: 2020-10-16 03:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 52198199a39a0752d429a06c48b67103 SHA-1: eddd835f05577f2401296ec78ceb4cf8fd4d1de1 SHA-256: 403f32f0878878d85cee5c50c4c2d5915c5780476e63cd94c50362cd4115602e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious due to the presence of numerous embedded URLs, many of which point to disposable hosting services and known redirector infrastructure. The document body contains a URL that appears to be a lure for a chat scoring service, and the PDF itself functions as a link farm, likely intended to lead users to phishing sites or download further malware. The ML classifier strongly supports the malicious verdict.

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.
  • 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.
  • 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/123?keyword=m+chat+scoring+pdf In PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/polamajado_xowakujagurub.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/lonew_xexasar_benavuvi_kipako.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/sirorepiwaxise_vosupemeras.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/4e0d994f.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3808383.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/nekomeped.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/xupuwuwirubajazuxemo.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/zuvekazabuz-topofelo-gupolekodojavo-ponabiloxe.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/ed1470441238e75.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/18b3dc9062.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/10d616.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/1302795.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kanasazizofowire.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/tokuvapowifov.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/62967b1e0.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/nixeku_fixagedu_vosimuxazuxitat_vokusa.pdfIn PDF document text
    • https://punadojum.weebly.com/uploads/1/3/2/6/132680976/5864344.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/bejosituzupini_xifofomonezuja_badukukowu.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/sulusilalope-jobede.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/3755b964-bae8-4358-8c4b-73ad7b2d80ad/42023282602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77dce6f6-488b-4ddd-ab75-a1e0cc8edfd0/90540766671.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_off00006218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 5388 bytes
SHA-256: 448490685d3a9a5dc6212a70a85eadff27306b11b4584c171d6e659cc01607fc
font_01_sfnt_off00007466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7466 9944 bytes
SHA-256: 8f083b71872fcecb40f3c5a4a15b315a6c1c44173d532a86e5131fc378ddc0f0

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