Malicious PDF — malware analysis report

Static analysis result for SHA-256 4582b3ac8d8c0396…

MALICIOUS

PDF

47.7 KB Created: 2020-10-19 04:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3726ef6117faa7aac4276b67d12a4c02 SHA-1: a21e82f97eb69ed74313a289c601c858b67b917f SHA-256: 4582b3ac8d8c03968f30594a56142a695faf206df129803869ab95ee0ad35271
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and ultimately redirect to a known malicious domain (ggtraff.ru). This indicates a link farm designed to drive traffic to malicious infrastructure, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=problemas+de+porcentajes+secundaria In PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/b2729c9.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/pibofijagewin.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/e96f81786d7f.pdfIn PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/nibeki-pamerupez-xemegi.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/f6115240c1cf.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/pukuka.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8276696.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/fibawubaxavuvabu.pdfIn PDF document text
    • https://leputixoted.weebly.com/uploads/1/3/2/6/132683438/9891377.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/kitunox-lomulezomeroxin.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/136ae.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/10620e7d-3b79-4c0b-ae4f-c198ac9a2aa3/understanding_the_purpose_and_power_of_woman_myles_munroe_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3902f8ec-cc33-4d08-ab48-74e1316fda6f/lefapupipazewemobawumesud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28bf28cf-aded-4948-9f0a-95f7761d5d40/10617901811.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0638/6595/files/mutinawituxulanibov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a53fc23-1aff-4511-a127-c9d3cd1d4b9f/divaroragib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b6d67d-bdbc-4958-9859-f699514d4975/tamemuxowewofif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a164f04-fe45-4892-ae89-64b0852e15ad/69071297160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0207289a-e3b7-436f-8807-a56dd8425d4d/44408231914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a5d7af-75df-49cc-9e2a-c94dbefdd9de/64561913579.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DD 5436 bytes
SHA-256: 5d2cb21bec777d28471d8503316114fc1fe4c9a5ec13a6d7942a68a6d2e2d093
font_01_sfnt_off00007637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7637 11244 bytes
SHA-256: d42d836f92d71e8f84e81bea198c35dad46a3e8f16fdc47b2a71d039e7b4a337
font_02_sfnt_off00009aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEC 16124 bytes
SHA-256: 073dee480399a0a44f59834a72d2ef372219071628d3787cc95d902351e1adc0