Malicious PDF — malware analysis report

Static analysis result for SHA-256 70674e3a88547aa5…

MALICIOUS

PDF

41.7 KB Created: 2020-07-08 23:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: f72491b2cfdfe6773af3e54ac9660470 SHA-1: 31128c5974b1bd1e9b608ab874307ffce95baf49 SHA-256: 70674e3a88547aa5858c012b08b8261ea81b6fba8531e8597d5acfff9f3d250f
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting domains. The primary link directs to a known malicious redirector, suggesting the document is part of a link farm designed to lead users to malicious websites. No scripts were extracted, but the embedded links and heuristic firings strongly indicate a phishing or redirection attack.

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.cc/wb?keyword=dyke%20wall%20calculation%20pdf In PDF document text
    • http://files.bookhivebeerclub.com/uploads/1/3/0/9/130969910/f65beae6b726.pdfIn PDF document text
    • http://files.letspaintarabic.com/uploads/1/3/1/3/131379612/22ab9b14a11.pdfIn PDF document text
    • http://files.rangersafc.co.nz/uploads/1/3/1/4/131438234/kodomowu.pdfIn PDF document text
    • http://files.werebyrne.net/uploads/1/3/0/7/130740127/ca57665e4b56a.pdfIn PDF document text
    • http://files.lifechangersinternational.org/uploads/1/3/1/4/131437472/buzijupogosados.pdfIn PDF document text
    • http://files.rathfrilandmotorclub.co.uk/uploads/1/3/2/3/132302913/zomawuzivoludi_petusol_mufawukemur_xitedelufukojob.pdfIn PDF document text
    • http://files.lutterburnfineart.co.uk/uploads/1/3/0/7/130739039/3163191.pdfIn PDF document text
    • http://files.mothersyoke.com/uploads/1/3/1/8/131856331/2222389.pdfIn PDF document text
    • http://files.shadysideofthetracks.com/uploads/1/3/1/4/131406762/9744250.pdfIn PDF document text
    • http://files.myprojectgive.org/uploads/1/3/0/9/130969532/zazarumisiriki-risanipebijazev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savakuwi.files.wordpress.com/2020/06/74922467564.pdfIn PDF document text
    • https://nusovegot.files.wordpress.com/2020/06/gefomaxobejipabeton.pdfIn PDF document text
    • https://ragorisi.files.wordpress.com/2020/06/zakajiwenonabajoxufaz.pdfIn PDF document text
    • https://pedonatip.files.wordpress.com/2020/06/6167533303.pdfIn PDF document text
    • https://molozujepaxu.files.wordpress.com/2020/06/68895548150.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37144816260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.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_off00006570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 5016 bytes
SHA-256: 6221e97e4fcae67276a87abc94c5bf6830a0bbe4085a7bc246e38c52ff21223f
font_01_sfnt_off000076b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B1 10636 bytes
SHA-256: 6836a870d691c85955c541a17bef6cd1131b72e25c4caae9e225319594023f4b