Malicious PDF — malware analysis report

Static analysis result for SHA-256 7438a316806fdd8f…

MALICIOUS

PDF

128.6 KB Created: 2020-05-27 01:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 479470fc7ac825ccb47446f6a0581143 SHA-1: 58700b16baef1dbccf7207e1f8996ce164320d22 SHA-256: 7438a316806fdd8fd92785161e0e8ac94834b6851ed57e400a9cafab22e00aba
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirect to potentially malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to traff.ru, indicating a likely attempt to redirect users to malicious content. The ML classifier also strongly indicates maliciousness.

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://ttraff.ru/wb?keyword=how+long+hurricane+katrina#how+long+hurricane+katrina In PDF document text
    • http://tayloredsolutionsgroup.com/uploads/1/3/1/3/131381555/f9530.pdfIn PDF document text
    • http://chevalier-finance.ch/uploads/1/3/0/2/130287932/jifevoborojewu.pdfIn PDF document text
    • http://islandadventureonline.com/uploads/1/3/1/0/131069891/3efd22199c80.pdfIn PDF document text
    • http://wanderingsofalix.com/uploads/1/3/0/5/130544078/kigiv.pdfIn PDF document text
    • https://jewarugunizu.files.wordpress.com/2020/05/70687027411.pdfIn PDF document text
    • https://degigox.files.wordpress.com/2020/05/piwuvunekuredevitunija.pdfIn PDF document text
    • https://mosagos.files.wordpress.com/2020/05/mukebinorefalawatojumepe.pdfIn PDF document text
    • https://semilizuburu.files.wordpress.com/2020/05/xaxaripatepim.pdfIn PDF document text
    • https://kegitefivoxu.files.wordpress.com/2020/05/13712273661.pdfIn PDF document text
    • https://zezupid.files.wordpress.com/2020/05/vakujupozo.pdfIn PDF document text
    • https://rebaxoduzun.files.wordpress.com/2020/05/30988226559.pdfIn PDF document text
    • https://tajevikasi.files.wordpress.com/2020/05/17846924523.pdfIn PDF document text
    • https://divezifek.files.wordpress.com/2020/05/vitozinigo.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://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001bb39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BB39 25900 bytes
SHA-256: a14cba6ea32a70c45ce68f13d1a57927d579c24fe2fa9e413a4cceaeff6389be

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