Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df0732ea825c81a…

MALICIOUS

PDF

48.1 KB Created: 2020-10-07 06:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e7dab580f411e907e3ae48980a515ef8 SHA-1: 60d60c1f91d5fec90c81283373430bad4ec95bc8 SHA-256: 3df0732ea825c81aa0d2b3c2205505156de844eb96ff68c7001694803214675b
124 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, further supporting a malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity.

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 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.link/pify?keyword=java+key+value+pair+collection In PDF document text
    • https://site-1038684.mozfiles.com/files/1038684/9499255137.pdfIn PDF document text
    • https://site-1039349.mozfiles.com/files/1039349/sozubinomaluka.pdfIn PDF document text
    • https://site-1039634.mozfiles.com/files/1039634/bemapisujo.pdfIn PDF document text
    • https://site-1038653.mozfiles.com/files/1038653/72110155271.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/14989987147.pdfIn PDF document text
    • https://site-1039952.mozfiles.com/files/1039952/95174030298.pdfIn PDF document text
    • https://site-1037896.mozfiles.com/files/1037896/zanufu.pdfIn PDF document text
    • https://site-1039793.mozfiles.com/files/1039793/rotitenefapofo.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/b293f065-6ef9-429a-a61c-bac63a457ccb/18661411702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6ea59d-7b24-4253-a8c5-1e2dcb55f39d/punuludodelujalawisufedit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/124e689a-67bc-40f2-beb8-ff6e57258a68/14924587896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0873/9488/files/pumax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7182/6841/files/enter_the_gungeon_multiplayer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3682/6007/files/14310026136.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_off00007e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E88 4964 bytes
SHA-256: 1a9b907dcc18e07a03db3e7ce70b22fd800193f1bba55f531cd465cd9f34f1b9
font_01_sfnt_off00008f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F98 10420 bytes
SHA-256: 4a7043b246a7db30ff8f45ec2aeab090fb92d657daa14cda54cc1b0a51bd3897

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