Malicious PDF — malware analysis report

Static analysis result for SHA-256 19074fc7f912ef56…

MALICIOUS

PDF

72.7 KB Created: 2020-10-11 08:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b080c278ac4ed742408dc1930351654a SHA-1: 1afc4ab5defd8fe04f3cca29810692786ff125ba SHA-256: 19074fc7f912ef561ff3be29db689048a242c722a6b035e545d921dd5477af62
184 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding numerous URLs that point to external PDF files hosted on disposable domains. One of the embedded URLs, 'https://ttraff.me/pify?keyword=senior+designer+salary+nyc', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's primary purpose appears to be SEO manipulation or traffic redirection rather than delivering a direct payload.

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.me/pify?keyword=senior+designer+salary+nyc In PDF document text
    • http://files.realtriv.com/uploads/1/3/1/4/131408502/b60a1bd.pdfIn PDF document text
    • http://zuruxi.prettydarnperfect.com/uploads/1/3/2/8/132814518/2452499.pdfIn PDF document text
    • http://files.drummodragons.com/uploads/1/3/2/3/132303064/damosajogi.pdfIn PDF document text
    • http://files.carnivaltourskochi.com/uploads/1/3/1/6/131637316/58c6096c12491.pdfIn PDF document text
    • http://files.unitestudents.org/uploads/1/3/1/4/131409037/89dd05d9.pdfIn PDF document text
    • https://site-1038409.mozfiles.com/files/1038409/voxozulifiduvosoj.pdfIn PDF document text
    • https://site-1036811.mozfiles.com/files/1036811/47789022283.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/e6fad62a-19c2-4d61-abbd-e08986ae4858/4231872559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8822a84d-7a01-46fa-abab-acd85a065fe0/fupoxixux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83537cd5-133e-4616-bd05-04e3abf3f8b1/tupapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b518f48-9944-4711-82b0-ffdc9bc98740/27866188215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c36c480-a837-41d5-8bc2-a4ff3c066d9b/levukafubomuzokataxuwaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f4657c-cedc-4a57-bcff-35474201ed22/43221028675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7f7510-4109-4873-a4c0-718a6233490e/zulinamixipimorimakik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af7246f-e863-4249-a8f2-3a4472e5ff54/limawokuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06c5fe1-d398-4b92-b4ff-6d7d71985acd/91370980616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeafa61b-5d63-473a-b823-af972c755a94/48629528503.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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 5312 bytes
SHA-256: acd0872bf66e17e61b2e2728dcc1097ef70c44f7727a065531240792f40b1f45
font_01_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 10508 bytes
SHA-256: faac84ae31f3efda1294f77e9153eb5d4d22726835e27863e82fde27e4afdbe7

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