Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2472cd8d187acd…

MALICIOUS

PDF

40.4 KB Created: 2020-10-12 13:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1718acd552a668c05b990ac8c52c04bf SHA-1: 7e29cda4fcf51a9f7f339db6384e6a1297ceeb3f SHA-256: ae2472cd8d187acde65070c2235cf88e34ba76acefde70a96586c152bb78da45
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or SEO spam campaign, designed to drive traffic to malicious sites.

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 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.
  • 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.com/pify?keyword=microrganismos+patogenicos+em+alimentos+pdf In PDF document text
    • https://site-1040516.mozfiles.com/files/1040516/17252871266.pdfIn PDF document text
    • https://site-1036639.mozfiles.com/files/1036639/jexukitatajasazomirojub.pdfIn PDF document text
    • https://site-1040080.mozfiles.com/files/1040080/50485830615.pdfIn PDF document text
    • https://site-1048224.mozfiles.com/files/1048224/jomuxavevejobulos.pdfIn PDF document text
    • https://site-1042968.mozfiles.com/files/1042968/90071055423.pdfIn PDF document text
    • http://files.learninghmb.com/uploads/1/3/1/3/131380453/4027346.pdfIn PDF document text
    • http://monakatax.loghousedesignsusa.com/uploads/1/3/1/8/131857650/varalaloboterizezesu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1570/6523/files/18449030719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7081/8970/files/dinosaurs_before_dark_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8502/0827/files/dark_continent_hxh_manga_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/kixume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/exterior_angle_inequality_theorem_lesson_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d28e5b-bd49-451b-a584-d981371e453e/kalab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7bcf13-8178-43d5-bd2f-2cc142bce4cf/27534308622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20d3d24-83ed-4883-b08b-731f4d53e17f/36063164638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b271469d-4aa1-4933-918f-ce4d99cd8b90/megonemabunof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e5c6fa-8209-47c5-a1c7-98b9a7981c6d/nulimimosaroleses.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_off00005f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F98 5480 bytes
SHA-256: 7516d1dd42894b510b073904d268776fd0e3ff6466d84871640b116c8cb62683
font_01_sfnt_off0000722c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x722C 10088 bytes
SHA-256: 0aaf21e14abe6ccfc44410cdbf5e8203b8eeceda304b31050da582dc39c300d0

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